Questions on Algebra: Quadratic Equation answered by real tutors!

Tutors Answer Your Questions about Quadratic Equations (FREE)

Question 1050587: Solve this system of equations using the addition method.
4a - 5b = 7
4a + 5b = 17
type the correct answer in the ordered pair form,then press enter
Click here to see answer by ikleyn(52777)

Question 1050615: 5x�+3x-8+4x�-7x+3-3x�-4x+1
Click here to see answer by Alan3354(69443)

Question 1050625: ype this equation in standard form.8y + 4 = -3x
Click here to see answer by josgarithmetic(39617)

Question 1050624: Solve this system of equations using the addition method.
4a - 5b = 7
4a + 5b = 17
type the correct answer in the ordered pair form,then press enter.
Click here to see answer by josgarithmetic(39617)

Question 1050553: A baseball is hit to centre field. The ball�s height h, in metres, after t seconds can be modelled by the function h = −5t^2 + 10t + 0.8 .
a. What is the maximum height above the ground that the baseball will reach?
b. When does the ball reach its maximum height?
c. How long does it take for the baseball to hit the ground?
Click here to see answer by Fombitz(32388)

Question 1050907: Solve -x^2-3x+1=0
Thank you so much! I am a writing teacher and my kids need help with their math. Trying to find free help as a parent is really hard, but this site is such a great idea!
Click here to see answer by Alan3354(69443)

Question 1050905: Hi there! Thank you for making this site an option for homework questions that my children have. That way I can help them.
Solve x^2+18x-40=0
Click here to see answer by lexiscares(1)

Question 1050906: Helping my kids with homework and need to refresh my memory on this stuff!
Solve x^2-12x=0
Click here to see answer by Alan3354(69443)

Question 1050922: Solve for x by completing the square: 2x^2+8x-7=-2
Click here to see answer by ewatrrr(24785)

Question 1051101: A rectangular piece of metal is 10 in longer than it is wide. Squares with sides
2 in long are cut from the four corners and the flaps are folded upward to form an open box. If the volume of the box is 528 in3, what were the original dimensions of the piece of metal?
Click here to see answer by ankor@dixie-net.com(22740)

Question 1051174: Hello! I need help! What is the greatest value of quadratic trinomial

Click here to see answer by Fombitz(32388)

Question 1051222: Identify the focus, directrix, and axis of symmetry of x=2y^2. Graph the equation.
I really don't understand this unit so any tips or help I would really appreciate. Thanks :)
Click here to see answer by josgarithmetic(39617)

Question 1051195: If people were willing and able to buy 1500 lbs of tomatoes when the price was
$8 per lb and
2500 lbs of tomatoes when the price was $6 per lb, derive the
demand curve, for tomatoes.
i am not sure if you have to use a formula (P = a − bQ) and then draw the graph.
i just used the above information and drew the graph as follows :
Price ($)
10
9
8
7
6
5
4
3
2
1
0
500 1000 1500 2000 2500 3000 Qty

Click here to see answer by josgarithmetic(39617)

Question 1051246: use the information on this sketch to calculate the width w of the river
Click here to see answer by Fombitz(32388)

Question 1051290: Find the value of k for which the quadratic curve y = 3px^2 + 2px + 1 touches the x acid exactly once.
Click here to see answer by ikleyn(52777)

Question 1051358: Find the values of m for which the quadratic curve y = 3 2mx^2 + 2mx + 1 touches the x axis exactly once .
Click here to see answer by josgarithmetic(39617)

Question 1051366: Integrate:X^3+X^2-3X-5
Click here to see answer by ikleyn(52777)

Question 1051371: Find the values of m for which the quadratic curve y = 3mx^2 + 2mx + 1 touches the x axis exactly once .
Click here to see answer by ikleyn(52777)

Question 1051403: I really need help for two questions.I tried doing these myself but I kept getting the wrong answers, and I'm not sure why. Please show your working so I can see how you get to the answer.
1) What is the axis of symmetry for a parabola whose zeros are 2 and 5 (as in, the parabola crosses the x-axis at 2 and 5). What I got was 3 1/2, but somehow that's wrong.
2) What is the axis of symmetry for this quadratic function y = 3x^2 - 6x - 2. First I got 18, then 27, but both were marked wrong.
Please help, I really want to know where I went wrong.
Click here to see answer by ewatrrr(24785)

Question 1051593: y=(-1/2) x^2-3x+11
find the max or min value ofy and the value of x when it occurs. thanks.
Click here to see answer by stanbon(75887)

Question 1051603: An emergency flare is launched from platform and its height h in metres after t seconds is given by the equation h =-4.9t^2 + 78.4t + 11.3
a)What is the maximum height of the flare?
b) after how many seconds does the flare reach the maximum height?
c) when will the flare hit the ground below?
d) determine the height of the platform
My attempt
a) -4.4(x-8)^2+324.9
b) 11.3 seconds
Click here to see answer by ewatrrr(24785)

Question 1051645: Solve using any way to solve quadratic equations. please show work
√ x+7 =-x^2+5
it's the square root of x+7=-x^2+5

Click here to see answer by ikleyn(52777)

Question 1051740: Find the negative root to the following equation. The answer is a fraction. Write the value (without using a negative) that corresponds to the value of numerator of the negative root.
12^2 - x - 105
Click here to see answer by Alan3354(69443)

Question 1051725: find the range of values of k for which kx+y=3 meets x�+y�=5 in two distinct points
Click here to see answer by Fombitz(32388)

Question 1051725: find the range of values of k for which kx+y=3 meets x�+y�=5 in two distinct points
Click here to see answer by ikleyn(52777)

Question 1051829: Find the standard deviation of the binomial random variable.

According to a college survey, 22% of all students work full time. Find the standard deviation for the random variable X, the number of students who work full time in samples of size 16. Round your answer to two decimal places
I used the square root *22*16*.84 but its not right am I using the right formula ?
Click here to see answer by rothauserc(4718)

Question 1051950: Solve (x-3/x+3)-(x+2/x-9)=48/7
Click here to see answer by Alan3354(69443)

Question 1051976: pls help me with this question
The hypotenuse of a right angled triangle is 3^5.If the smaller side is tripled and the larger side is doubled the new hypotenuse is 15cm.Find the length of each sides
Click here to see answer by ikleyn(52777)

Question 1052155: Determine the equation of the quadratic function f(x) given that the vertex is (1,-5) and the function has a y-intercept at 3.
Click here to see answer by stanbon(75887)

Question 1052226: This is the question I'm having trouble with. I'm taking accelerated math in 7th grade, and I have to find what the variable c equals...
12(c-8) + 15 + 4c= 1711
Click here to see answer by josgarithmetic(39617)

Question 1052270: How can I find the equation for the next problem: from each corner of a square piece of sheet metal, remove a square of side 9 centimeters. Turn up the edges to form an open box. If the box is to hold 144 cubic centimeters, what should be the dimensions of the piece of sheet metal?
Click here to see answer by josmiceli(19441)

Question 1052457: Find the vertex of the parabala y=-x^2+2
Click here to see answer by josgarithmetic(39617)

Question 1052457: Find the vertex of the parabala y=-x^2+2
Click here to see answer by MathTherapy(10551)

Question 1052405:  A rocket is launched from 180 feet above the ground at time t=0 . The function that models this situation is given by h=-16t^2+96t+180
, where t is measured in seconds and is height above the ground measured in feet.
 What is a reasonable domain restriction for t in this context?
 Determine the height of the rocket two seconds after it was launched.
 Determine the maximum height obtained by the rocket.
 Determine the time when the rocket is 100 feet above the ground.
 Determine the time at which the rocket hits the ground.
 How would you refine your answer to the first question based on your response to the second and fifth questions?
Click here to see answer by Alan3354(69443)

Question 1052468: Given the quadratic function f and the fact that f=(-1)=f(2) how can you find the axis of symmetry
Click here to see answer by ikleyn(52777)

Question 1052484: What 2 numbers can be multiplied to equal 3 and add up to equal -5 ?
Click here to see answer by ikleyn(52777)

Question 1052409: Rewrite the function f(x) = 2x^2- 8x + 9 in vertex form by completing the square.Also find the minimum value?
Click here to see answer by josgarithmetic(39617)

Question 1052409: Rewrite the function f(x) = 2x^2- 8x + 9 in vertex form by completing the square.Also find the minimum value?
Click here to see answer by ikleyn(52777)

Question 1052495: Find the number of real solutions using the discriminant
x^2 - 25 = 0
I already tried doing this and got two real solutions, but it was marked wrong. Please show your working so I can see where I went wrong. ^_^
Click here to see answer by Edwin McCravy(20054)

Question 1052591: Graph g(x)=-.5(x-3)^2+2
Click here to see answer by Alan3354(69443)

Question 1052592: henry jumps from a platform 10 meters above the surface of the water. the height of henry's jump can be modeled by the function h(t) = -5.3t^2 + 4.8t +10, where t is time in seconds after the jump. At what time t is henry 3 meters above the water?
Click here to see answer by Alan3354(69443)

Question 1052668: Solve the equation by graphing. State the exact roots.
x^2 + 5x - 2 = 0
Click here to see answer by Fombitz(32388)

Question 1052691: height of an object thrown from 60 feet up, with an initial speed of 48 feet/second is given by h(t)=-16t^2+48t+60. When will the object reach its maximum height? What will the maximum height be?
Click here to see answer by htmentor(1343)

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