Questions on Algebra: Quadratic Equation answered by real tutors!

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Question 806148: The product of two numbers is 28. If the second number is one more than twice the first number, what are the two sets of numbers?
Click here to see answer by mananth(16946)

Question 806307: Given the points (-2,0), (0,4) and (3,0) find the quadratic equations. I know I am supposed to set it up as
4a-2b+c=0
0a+0b+0c=4
9a+3b+c=0
and eliminate the values but I just can't seem to find the right answers
thanks for your help
Click here to see answer by solver91311(24713)

Question 806425: W2-15=0. One solution is 4. What is the other solution?
Click here to see answer by Alan3354(69443)

Question 806438: How do I find the height of the equation -16t^2 + 34t when it's set equal to 20?
Click here to see answer by Alan3354(69443)

Question 806616: determine the values of p for which the quadratic equation 2xsquare+px+8=0 has real roots.
Click here to see answer by solver91311(24713)

Question 806717: A stone is thrown directly upward from a height of 50 feet with an initial velocity of 56 ft/sec. The height of the stone "t" seconds after it has been thrown is given by the formula s(t)=-16t^2+56t+50. Use the appropriate algebraic formula to determine the time at which the ball reaches its maximum height and find what the maximum height is.
Click here to see answer by richwmiller(17219)

Question 806774: Equal squares of side length x are removed from each corner of a 25 inch by 30 inch piece of cardboard. The sides are turned up to form a box with no top.
What values of x make sense in this problem solution? What is the domain?
Click here to see answer by solver91311(24713)

Question 807340: Simplify 5x-2x(3+2)+5(x-4)
Click here to see answer by jim_thompson5910(35256)

Question 807347: Factorise 3x^2 + 15x-42
Click here to see answer by jim_thompson5910(35256)

Question 807343: Evaluate b^2-4b(2x+y)-5x if b= 4, x= 3 , y= -8
Click here to see answer by jim_thompson5910(35256)

Question 807408: Can I please get some help to Solve the following quadratic equation by quadratic formula.
x squared - 10x = -24
Click here to see answer by josmiceli(19441)

Question 807684: what is the parabola that passes through each set of points (0,5),(2,-3),(-1,12)

Click here to see answer by DrBeeee(684)

Question 807766: A thee hour river cruise goes 15km upstream and then back again. The river has a current of 2km an hour. What is the boat's speed and how long was the upstream journey?
Click here to see answer by josgarithmetic(39613)

Question 807845: A toy rocket is launched directly upward from the ground with an initial velocity of 90ft/sec. Give a function h(x) that describes the rocket height in terms of time

Click here to see answer by josmiceli(19441)

Question 807882: How do you work out this quadratic equation 256x^4-625y^4.
Click here to see answer by josmiceli(19441)

Question 807882: How do you work out this quadratic equation 256x^4-625y^4.
Click here to see answer by richwmiller(17219)

Question 807881: Why doesn't 256 r^2 + 289 = 0 have a real solution? And why can't it be solved using factorization?

Click here to see answer by josmiceli(19441)

Question 807881: Why doesn't 256 r^2 + 289 = 0 have a real solution? And why can't it be solved using factorization?

Click here to see answer by stanbon(75887)

Question 807807: xy^2 over xy^3
Click here to see answer by jim_thompson5910(35256)

Question 807987: Please help me answer this question
A small rock sits on the edge of a tall building. A strong wind blows the rock off the edge. The distance in feet between the rock and the ground t seconds after the rock leaves the edge is given by d=-16t^2-8t+500.
If the answer is not an integer enter it as a decimal. round to the nearest hundredth, if needed.
how many seconds after the rock leaves the edge is it 464 feet from the ground?
------------seconds
How many seconds after the rock leaves the edge does it hit the ground?
------------- seconds

Click here to see answer by richwmiller(17219)

Question 808017: for what value of K are the qd. equation (k+4)x^+(k+1)x+1=0 has equal roots.
Click here to see answer by mananth(16946)

Question 807981: A ladder 2x+1 feet is positioned against a wall such that the bottom is x-1 feet away from a wall. The distance between the floor and the top of the ladder is 2x feet.
Find the length, in feet of the ladder;
Assume that a right angle is formed by the wall and the floor;
The length of the ladder is --------- feet?
Click here to see answer by mananth(16946)

Question 807351: Simplify
X^2-3x over x^2-9 times 2x+6 over x+3
Click here to see answer by tommyt3rd(5050)

Question 807339: Use the formula x = -b+_ square root b^2-4ac over 2a to solve the equation 3x^2 = 2x +5
Click here to see answer by tommyt3rd(5050)

Question 807337: Use the formula x = -b+_ square root b^2-4ac over 2a to solve the equation 3x^2 = 2x +5
Click here to see answer by tommyt3rd(5050)

Question 807403: Can I please get some assistance or help me to understand how to expand the following? Thank you
(3x+4) (x-2)
Click here to see answer by tommyt3rd(5050)

Question 807335: The area of a rectangle is 80 sq meters. the length is one more than three times the width. Find the dimensions of the rectangle.

(Please show work)
Click here to see answer by tommyt3rd(5050)

Question 807350: Factorise xy^2-3xy-10x
Click here to see answer by tommyt3rd(5050)

Question 808094: For the parabola find the vertex,focus and directrix
a) x^2 + 6x + 4y + 5 = 0
b) y^2 + 6y - 8x - 31 = 0
Can you please help me out? Thank you
Click here to see answer by Edwin McCravy(20054)

Question 808200: if roots of the quadratic equation x^2-31+a=0 are prime numbers , then the value of a is ?
Click here to see answer by JBarnum(2146)

Question 808174: Find an equation of a parabola with focus (0,-7) and directrix y = 7
Can you please help me out? Thank you
Click here to see answer by lwsshak3(11628)

Question 808314: You have an outdoor pool measuring 25 ft x 10 ft. You want to add a cement walkway around the pool. If the walkway will be 1 ft thick and you have 304 cubic feet of cement, how wide should the walkway be?
Click here to see answer by Alan3354(69443)

Question 808458: Can I please get some assistance to expand the following question?
(3x+1) (3x-1)
Click here to see answer by Alan3354(69443)

Question 808457: Can I please get some assistance to help me expand this question?
(x-6)squared
Click here to see answer by Alan3354(69443)

Question 808461: Can I please get help to figure out the quadratic application for the following question? Thank you so much.
The length of a poster is 10cm longer than its width. If the area of the poster
is 1200cm2 , what is the width of the poster.
Click here to see answer by Alan3354(69443)

Question 808459: Can I please get some help to solve the following quadratic equation by using the factorising method? Thank you
2xsquared - 11x - 6 = 0
Click here to see answer by MathLover1(20849)

Question 808510: find the two positive integers if the number are consecutive odd numbers and their product is 143.
Click here to see answer by Alan3354(69443)

Question 808539: please help me solve this equation
x^2+2x+1+c^2
Click here to see answer by JBarnum(2146)

Question 808821: What is 4xsquared-9=0

Click here to see answer by rfer(16322)

Question 808869: A parabola has a axis of symmetry x=2 and passes through the points (0,7) and (-1,-3) what is its equation?
Click here to see answer by solver91311(24713)

Question 809059: X^2+y^2-4x+6y-3, The answer was given but I cannot solve. Test tomorrow. Please solve. Thanks
Click here to see answer by stanbon(75887)

Question 809267: How would you solve x^2+7+12/x^2-7+12=3

Click here to see answer by solver91311(24713)

Question 809284: Write a quadratic function that fits each set of points. (0,1) (2,-1) (3,-8)
Click here to see answer by solver91311(24713)

Question 809376: I know this equation has a quadratic form but if I factor out the x^2 it does not make sense.
x^4-4x^2-12=0
So how would I find the roots of this equation?
Click here to see answer by edjones(8007)

Question 809406: A fruit farmer planted a + 3 apple trees in each of a rows. If another row containing the same number of apple trees is planted, which of the following expressions represents the total number of planted apple trees?
Click here to see answer by edjones(8007)

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