Questions on Algebra: Quadratic Equation answered by real tutors!

Tutors Answer Your Questions about Quadratic Equations (FREE)

Question 923865: PLEASE HELP ME IF ANYONE CAN..(IF 2X+7=12 THEN 4X-7=
OPTIONS ARE
(A)2
(B)2.5
(C)3
(D)10
(E)13
Click here to see answer by ewatrrr(24785)

Question 923868: PLEASE IF ANYONE CAN HELP SO PLEASE ATTEMPT IT
IF X-Y=0,THEN XY MUST EQUAL WHICH OF THE FOLLOWING?
(A)0
(B)1
(C)X
(D)X^2
PLEASE EXPLAIN ME TOO HOW YOU DID IT
Click here to see answer by TimothyLamb(4379)

Question 923867: PLEASE PLEASE HELP ME IF SOME ONE CAN
IF THE SUM OF THE FIRST N POSITIVE INTEGERS IS EQUAL TO N(N+1)/2,THEN THE SUM OF THE FIRST 25 POSITIVE INTEGERS IS.....OPTIONS ARE
(A)51
(B)52
(C)313
(D)20
(E)25
Click here to see answer by TimothyLamb(4379)

Question 923858: The parabola given by the equation y=3x^2-30 x+18 has its vertex at (h,k) for:
h=
and
k=
Click here to see answer by ewatrrr(24785)

Question 923858: The parabola given by the equation y=3x^2-30 x+18 has its vertex at (h,k) for:
h=
and
k=
Click here to see answer by Cromlix(4381)

Question 923873: Give the domain and range of h(x) = x^{2} + 9
a) What is the domain of h(x)?
Write your answer in interval notation. If the domain is all real numbers x such that x<-4 then enter (-inf,-4). If the range is all real numbers enter "All real numbers" (no quotes).
b) What is the range of h(x)?
Write your answer in interval notation. If the range is all real numbers y such that y>=9 then enter [9,inf). If the range is all real numbers enter "All real numbers" (no quotes).
how do I get A please thanks
Click here to see answer by ewatrrr(24785)

Question 923905: G(x)=3x^2-4x-1
Click here to see answer by Alan3354(69443)

Question 923693: Evaluate
2x-10/100-x
Click here to see answer by Alan3354(69443)

Question 923917: Please help me with the problem below:
Give three examples of the equations of parabolas that have (0,5) as the y-axis intercept
Click here to see answer by Alan3354(69443)

Question 923916: Please help me with the problem below:
Give three examples of the equation of a parabola whose vertex is (-1/2,0)
Click here to see answer by ewatrrr(24785)

Question 923941: The golden ratio was used in ancient Greek architecture. The sides of a rectangle are in the Golden Ratio when "the ratio of the long side to the short side equals the ratio of the sum of the long and short sides to the long side."
If the short side of a rectangle is 1 cm then find the length of the long side. Leave your answer as an irrational number.
My answer so far:
X/1 = (x+1)/x
X2 (x squared) - x -1=0
I don't know how to get to the irrational number that the question is requesting.
Click here to see answer by ankor@dixie-net.com(22740)

Question 923860: Use your calculator to find an equation in the form f(x)=ax^2+bx+c to fit the values below.
x -8 -6 -4 -2 0
f(x) -19 -1 5 -1 -19
f(x)=
Click here to see answer by josgarithmetic(39613)

Question 923970: 5x^2+3x+5=0
What is the discriminant
Click here to see answer by MathLover1(20849)

Question 924062: Suppose f(x) = (x-7)(x+4).
(a) For which values of x is the function f(x) positive? Enter your answer using inequalities.
help (inequalities)
(B) For which values of x is the function f(x) negative? Enter your answer using inequalities.
help (inequalities)
need part b please already got part a
Click here to see answer by Theo(13342)

Question 924017: Question 4 Given y = x^2-x-6
a) Determine the x-intercepts.

b) Determine the turning point.

d) Determine the y-intercept.

e) Hence, or otherwise, sketch the graph of y = x^2-x-6

Click here to see answer by rothauserc(4718)

Question 924080: Write the quadratic equation whose roots are −4 and 3, and whose leading coefficient is 5.
Click here to see answer by Theo(13342)

Question 924080: Write the quadratic equation whose roots are −4 and 3, and whose leading coefficient is 5.
Click here to see answer by josmiceli(19441)

Question 924083: Annual consumption of bottled water in the United States is given in the table. Let C(t) be the billions of gallons consumed t years since 1990.
Year Bottled water consumption (billions of gallons
1990 2.2
1992 2.4
1994 3.0
1996 3.5
1998 4.1
2000 4.9
2002 6.0
2003 6.4
a) Create a scattergram for the data on your calculator.
b) Graph the function C(t)=.016t^2+.116t+2.184 on the same window as your scatterplot.
c) Does the model fit the data?
d) Find C(24) and interpret its meaning. (Round the value to two decimal places.)
The bottled water consumption in the year will be billion gallons.
need help with getting the first part of d for the years dont get how you get that I got the rest.
Click here to see answer by ewatrrr(24785)

Question 924186: The Discriminant Problem: The roots of the equation
2x2+6x+5=0
1]imaginary
2] real and irrational
3]real, rational and unequal
4]real, rational and equal
Click here to see answer by ewatrrr(24785)

Question 924209: how can I solve and graph this function?
y= =1/2x^ - 3x + 3
Click here to see answer by stanbon(75887)

Question 924021: An aeroplane left 30 minutes later than it schedule time and in order to reach its destination 1500
km away in time, it had to increase its speed by 250 km/hr from its usual speed. Determine its
usual speed.
Click here to see answer by MathTherapy(10549)

Question 924422: write the quadratic equation whose roots are -2 and 2, and whose leading coefficient is 2.
Click here to see answer by Fombitz(32388)

Question 924596: Write the quadratic equation whose roots are 4 and 5, and whose leading coefficient is 2.
(Use X to represent the variable).
Click here to see answer by ewatrrr(24785)

Question 924607: Compute the value of the discriminant and give the number of real solutions of the quadratic equation:
-3x^2+4x-7=0
Discriminent:
number of real solutions:
Click here to see answer by ewatrrr(24785)

Question 924942: x-9y+4z=1
-2x+9y-4z=-3
2x+y-4z=-3
What does x, y, and z equal! I need to solve either by substitution or elimination
Click here to see answer by TimothyLamb(4379)

Question 924942: x-9y+4z=1
-2x+9y-4z=-3
2x+y-4z=-3
What does x, y, and z equal! I need to solve either by substitution or elimination
Click here to see answer by stanbon(75887)

Question 924934: Hi,
I'm having trouble with this question from my A level Integration module;
Find the equation for a quadratic curve that passes through O(0,0) and its gradient at the point (-2,3) is -1.
I can integrate a differentiated function to get it's original, but without the differential I'm stuck on this and can't see where to begin.
Thanks,
R
Click here to see answer by Fombitz(32388)

Question 924912: A magazine company had a profit of $98,000 per year when it had 32,000 subscribers. When it obtained 38,000 subscribers, it had a profit of $126,500. Assume that the profit P is a linear function of the number of subscribers s.
(a) Find the function P.
P(s) = (i got 6.125s - 98000) but it said it was wrong

(b) What will the profit be if the company obtains 50,000 subscribers?
$
i also got 208250 and it said that was wrong too
(c) What is the number of subscribers needed to break even?

and once agin i got 16000 subscribers and got that wrong as well please help.
...........................................................................

The data in the table below show the distance, in feet, a ball travels for various swing speeds, in miles per hour, of a bat.
Bat speed (mph) Distance (ft)
40 201
45 212
50 239
60 274
70 300
75 326
80 332
(a) Find the linear regression equation for these data. (Round your coefficients to three decimal places. A graphing calculator is recommended.)
y =
(b) Using the regression model, what is the expected distance a ball will travel when the bat speed is 58 miles per hour? (Round your answer to the nearest foot.)
ft
this one im absolutly stuck on and keep getting everything wrong....

my email is crystalrainstone@yahoo.com
Click here to see answer by ewatrrr(24785)

Question 925060: Get a 3 decimal digit approximation of the square root of 34.
Click here to see answer by Alan3354(69443)

Question 925216: when a regiment is arranged in a perfect square,the number of soldiers in the front row is 15 less than the number of soldiers in front row arranged in 4 deep hollow square.find the number of soldiers?

Click here to see answer by Edwin McCravy(20054)

Question 925302: what solution can you derive for ax^2+bx+c=0 by initially dividing by X^2
Click here to see answer by Alan3354(69443)

Question 925325: Solve for x the following quadratic equations by factoring
X squared - 5x +6=0
Click here to see answer by TimothyLamb(4379)

Question 925327: Solve for x the following quadratic equations by factorising
X squared -6x+8=0
Click here to see answer by ewatrrr(24785)

Question 925329: Solve for x the following quadratic equations by factoring
X squared minus 5x minus 24=0
Click here to see answer by TimothyLamb(4379)

Question 925531: x to the 3rd power -64=0

Click here to see answer by MathLover1(20849)

Question 925474: X^2 + MX + 12 = 0
the first root of x is 3 times larger than the second root x what are the values of M

Click here to see answer by josgarithmetic(39613)

Question 925564: 8+(-20)*3
Click here to see answer by rfer(16322)

Question 925668: Algebraically find the equation of the parabola containing the points f(1)=4, f(2)=12 and f(4)=46. Place your answer in f(x)=ax^2+bx+c form.
Click here to see answer by ewatrrr(24785)

Question 925708: Quadratic equations. Solve for x value. Sorry I don't know the sign/symbol for square on computer.
1) 5x squared -13x+6=0
2)2x square+4x=3x
3)3xsquare-5x=0
Click here to see answer by ewatrrr(24785)

Question 925871: The length of a rectangle is 1m greater than the width. The area of the rectangle is 110m^2. Find the length of the rectangle.
Click here to see answer by Alan3354(69443)

Question 925928: the length of a photograph is 8 cm more than its width. It has an area of 20cm2. Write an equation and solve to find the dimensions of the photograph
Click here to see answer by TimothyLamb(4379)

Question 925949: Locate the coordinates of the peak of the roof if it is to have a pitch of
3/5 and the roof line is to pass through the two points in black
http://www.webassign.net/tussymodnc1/5-5-086.gif
Click here to see answer by josgarithmetic(39613)

Question 925987: Write the equation of the quadratic function with roots 6 and 10 and a vertex at (8, 2).
Click here to see answer by josgarithmetic(39613)

Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935, 1936..1980, 1981..2025, 2026..2070, 2071..2115, 2116..2160, 2161..2205, 2206..2250, 2251..2295, 2296..2340, 2341..2385, 2386..2430, 2431..2475, 2476..2520, 2521..2565, 2566..2610, 2611..2655, 2656..2700, 2701..2745, 2746..2790, 2791..2835, 2836..2880, 2881..2925, 2926..2970, 2971..3015, 3016..3060, 3061..3105, 3106..3150, 3151..3195, 3196..3240, 3241..3285, 3286..3330, 3331..3375, 3376..3420, 3421..3465, 3466..3510, 3511..3555, 3556..3600, 3601..3645, 3646..3690, 3691..3735, 3736..3780, 3781..3825, 3826..3870, 3871..3915, 3916..3960, 3961..4005, 4006..4050, 4051..4095, 4096..4140, 4141..4185, 4186..4230, 4231..4275, 4276..4320, 4321..4365, 4366..4410, 4411..4455, 4456..4500, 4501..4545, 4546..4590, 4591..4635, 4636..4680, 4681..4725, 4726..4770, 4771..4815, 4816..4860, 4861..4905, 4906..4950, 4951..4995, 4996..5040, 5041..5085, 5086..5130, 5131..5175, 5176..5220, 5221..5265, 5266..5310, 5311..5355, 5356..5400, 5401..5445, 5446..5490, 5491..5535, 5536..5580, 5581..5625, 5626..5670, 5671..5715, 5716..5760, 5761..5805, 5806..5850, 5851..5895, 5896..5940, 5941..5985, 5986..6030, 6031..6075, 6076..6120, 6121..6165, 6166..6210, 6211..6255, 6256..6300, 6301..6345, 6346..6390, 6391..6435, 6436..6480, 6481..6525, 6526..6570, 6571..6615, 6616..6660, 6661..6705, 6706..6750, 6751..6795, 6796..6840, 6841..6885, 6886..6930, 6931..6975, 6976..7020, 7021..7065, 7066..7110, 7111..7155, 7156..7200, 7201..7245, 7246..7290, 7291..7335, 7336..7380, 7381..7425, 7426..7470, 7471..7515, 7516..7560, 7561..7605, 7606..7650, 7651..7695, 7696..7740, 7741..7785, 7786..7830, 7831..7875, 7876..7920, 7921..7965, 7966..8010, 8011..8055, 8056..8100, 8101..8145, 8146..8190, 8191..8235, 8236..8280, 8281..8325, 8326..8370, 8371..8415, 8416..8460, 8461..8505, 8506..8550, 8551..8595, 8596..8640, 8641..8685, 8686..8730, 8731..8775, 8776..8820, 8821..8865, 8866..8910, 8911..8955, 8956..9000, 9001..9045, 9046..9090, 9091..9135, 9136..9180, 9181..9225, 9226..9270, 9271..9315, 9316..9360, 9361..9405, 9406..9450, 9451..9495, 9496..9540, 9541..9585, 9586..9630, 9631..9675, 9676..9720, 9721..9765, 9766..9810, 9811..9855, 9856..9900, 9901..9945, 9946..9990, 9991..10035, 10036..10080, 10081..10125, 10126..10170, 10171..10215, 10216..10260, 10261..10305, 10306..10350, 10351..10395, 10396..10440, 10441..10485, 10486..10530, 10531..10575, 10576..10620, 10621..10665, 10666..10710, 10711..10755, 10756..10800, 10801..10845, 10846..10890, 10891..10935, 10936..10980, 10981..11025, 11026..11070, 11071..11115, 11116..11160, 11161..11205, 11206..11250, 11251..11295, 11296..11340, 11341..11385, 11386..11430, 11431..11475, 11476..11520, 11521..11565, 11566..11610, 11611..11655, 11656..11700, 11701..11745, 11746..11790, 11791..11835, 11836..11880, 11881..11925, 11926..11970, 11971..12015, 12016..12060, 12061..12105, 12106..12150, 12151..12195, 12196..12240, 12241..12285, 12286..12330, 12331..12375, 12376..12420, 12421..12465, 12466..12510, 12511..12555, 12556..12600, 12601..12645, 12646..12690, 12691..12735, 12736..12780, 12781..12825, 12826..12870, 12871..12915, 12916..12960, 12961..13005, 13006..13050, 13051..13095, 13096..13140, 13141..13185, 13186..13230, 13231..13275, 13276..13320, 13321..13365, 13366..13410, 13411..13455, 13456..13500, 13501..13545, 13546..13590, 13591..13635, 13636..13680, 13681..13725, 13726..13770, 13771..13815, 13816..13860, 13861..13905, 13906..13950, 13951..13995, 13996..14040, 14041..14085, 14086..14130, 14131..14175, 14176..14220, 14221..14265, 14266..14310, 14311..14355, 14356..14400, 14401..14445, 14446..14490, 14491..14535, 14536..14580, 14581..14625, 14626..14670, 14671..14715, 14716..14760, 14761..14805, 14806..14850, 14851..14895, 14896..14940, 14941..14985, 14986..15030, 15031..15075, 15076..15120, 15121..15165, 15166..15210, 15211..15255, 15256..15300, 15301..15345, 15346..15390, 15391..15435, 15436..15480, 15481..15525, 15526..15570, 15571..15615, 15616..15660, 15661..15705, 15706..15750, 15751..15795, 15796..15840, 15841..15885, 15886..15930, 15931..15975, 15976..16020, 16021..16065, 16066..16110, 16111..16155, 16156..16200, 16201..16245, 16246..16290, 16291..16335, 16336..16380, 16381..16425, 16426..16470, 16471..16515, 16516..16560, 16561..16605, 16606..16650, 16651..16695, 16696..16740, 16741..16785, 16786..16830, 16831..16875, 16876..16920, 16921..16965, 16966..17010, 17011..17055, 17056..17100, 17101..17145, 17146..17190, 17191..17235, 17236..17280, 17281..17325, 17326..17370, 17371..17415, 17416..17460, 17461..17505, 17506..17550, 17551..17595, 17596..17640, 17641..17685, 17686..17730, 17731..17775, 17776..17820, 17821..17865, 17866..17910, 17911..17955, 17956..18000, 18001..18045, 18046..18090, 18091..18135, 18136..18180, 18181..18225, 18226..18270, 18271..18315, 18316..18360, 18361..18405, 18406..18450, 18451..18495, 18496..18540, 18541..18585, 18586..18630, 18631..18675, 18676..18720, 18721..18765, 18766..18810, 18811..18855, 18856..18900, 18901..18945, 18946..18990, 18991..19035, 19036..19080, 19081..19125, 19126..19170, 19171..19215, 19216..19260, 19261..19305, 19306..19350, 19351..19395, 19396..19440, 19441..19485, 19486..19530, 19531..19575, 19576..19620, 19621..19665, 19666..19710, 19711..19755, 19756..19800, 19801..19845, 19846..19890, 19891..19935, 19936..19980, 19981..20025, 20026..20070, 20071..20115, 20116..20160, 20161..20205, 20206..20250, 20251..20295, 20296..20340, 20341..20385, 20386..20430, 20431..20475, 20476..20520, 20521..20565, 20566..20610, 20611..20655, 20656..20700, 20701..20745, 20746..20790, 20791..20835, 20836..20880, 20881..20925, 20926..20970, 20971..21015, 21016..21060, 21061..21105, 21106..21150, 21151..21195, 21196..21240, 21241..21285, 21286..21330, 21331..21375, 21376..21420, 21421..21465, 21466..21510, 21511..21555, 21556..21600, 21601..21645, 21646..21690, 21691..21735, 21736..21780, 21781..21825, 21826..21870, 21871..21915, 21916..21960, 21961..22005, 22006..22050, 22051..22095, 22096..22140, 22141..22185, 22186..22230, 22231..22275, 22276..22320, 22321..22365, 22366..22410, 22411..22455, 22456..22500, 22501..22545, 22546..22590, 22591..22635, 22636..22680, 22681..22725, 22726..22770, 22771..22815, 22816..22860, 22861..22905, 22906..22950, 22951..22995, 22996..23040, 23041..23085, 23086..23130, 23131..23175, 23176..23220, 23221..23265, 23266..23310, 23311..23355, 23356..23400, 23401..23445, 23446..23490, 23491..23535, 23536..23580, 23581..23625, 23626..23670, 23671..23715, 23716..23760, 23761..23805, 23806..23850, 23851..23895, 23896..23940, 23941..23985, 23986..24030, 24031..24075, 24076..24120, 24121..24165, 24166..24210, 24211..24255, 24256..24300, 24301..24345, 24346..24390, 24391..24435, 24436..24480, 24481..24525, 24526..24570, 24571..24615, 24616..24660, 24661..24705, 24706..24750, 24751..24795, 24796..24840, 24841..24885, 24886..24930, 24931..24975, 24976..25020, 25021..25065, 25066..25110, 25111..25155, 25156..25200, 25201..25245, 25246..25290, 25291..25335, 25336..25380, 25381..25425, 25426..25470, 25471..25515, 25516..25560, 25561..25605, 25606..25650, 25651..25695, 25696..25740, 25741..25785, 25786..25830, 25831..25875, 25876..25920, 25921..25965, 25966..26010, 26011..26055, 26056..26100, 26101..26145, 26146..26190, 26191..26235, 26236..26280, 26281..26325, 26326..26370, 26371..26415, 26416..26460, 26461..26505, 26506..26550, 26551..26595, 26596..26640, 26641..26685, 26686..26730, 26731..26775, 26776..26820, 26821..26865, 26866..26910, 26911..26955, 26956..27000, 27001..27045, 27046..27090, 27091..27135, 27136..27180, 27181..27225, 27226..27270, 27271..27315, 27316..27360, 27361..27405, 27406..27450, 27451..27495, 27496..27540, 27541..27585, 27586..27630, 27631..27675, 27676..27720, 27721..27765, 27766..27810, 27811..27855, 27856..27900, 27901..27945, 27946..27990, 27991..28035, 28036..28080, 28081..28125, 28126..28170, 28171..28215, 28216..28260, 28261..28305, 28306..28350, 28351..28395, 28396..28440, 28441..28485, 28486..28530, 28531..28575, 28576..28620, 28621..28665, 28666..28710, 28711..28755, 28756..28800, 28801..28845, 28846..28890, 28891..28935, 28936..28980, 28981..29025, 29026..29070, 29071..29115, 29116..29160, 29161..29205, 29206..29250, 29251..29295, 29296..29340, 29341..29385, 29386..29430, 29431..29475, 29476..29520, 29521..29565, 29566..29610, 29611..29655, 29656..29700, 29701..29745, 29746..29790, 29791..29835, 29836..29880, 29881..29925, 29926..29970, 29971..30015, 30016..30060, 30061..30105, 30106..30150, 30151..30195, 30196..30240