Questions on Algebra: Quadratic Equation answered by real tutors!

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Question 600872: complete the square, and find the roots of the quadratic equation.
x2 + 6x -16= 0

Click here to see answer by nerdybill(7384)

Question 600984: The graph of y=-2x^2 + 15x + c contains (3, 89). Find the value of c.
A. 50
B. 62
C. 26
D. none of these
Click here to see answer by lynnlo(4176)

Question 600984: The graph of y=-2x^2 + 15x + c contains (3, 89). Find the value of c.
A. 50
B. 62
C. 26
D. none of these
Click here to see answer by Earlsdon(6294)

Question 600958: Helllllp I don't know how to find a discriminant. u_u
ex: 2x^2+5x+6=0

d=
# of real number solutions:

Also, suppose a parabola has a vertex in Quadrant I and a<0 in the equation y=ax^2+bx+c. How many real solutions will the equation ax^2+bx+c=o have?

Click here to see answer by lawdej(58)

Question 600979: During the first part of a trip, a canoeist travels 45 miles at a certain speed. The canoeist travels 20 miles on the second part of the trip at a speed 5 mph slower. The total time for the trip is 2 hrs. What was the speed on each part of the trip?
The speed on the first part of the trip was _______ mph.
Click here to see answer by ankor@dixie-net.com(22740)

Question 601162: how do you solve a qudratic equation?
Click here to see answer by solver91311(24713)

Question 601192: please help me construct a quadratic equation with the solutions of sqr(3) and sqr(-3)
Click here to see answer by solver91311(24713)

Question 601306: 12x^2-15=0
Click here to see answer by flame8855(424)

Question 601283: apply the quadratic formula to find the roots of the given function, and then graph the function.
0 = x� - 9
Click here to see answer by Edwin McCravy(20054)

Question 601378: (x-3)^2=9
Click here to see answer by w_parminder(53)

Question 601378: (x-3)^2=9
Click here to see answer by lawdej(58)

Question 601401: How do you find all the x-intercepts of the given function:
f(x)=(x2-6x)2-22(x2-6x)-135
the "2"'s are squares
Click here to see answer by ewatrrr(24785)

Question 601432: Solve the Equation.
x-10^x+24=0
Click here to see answer by Alan3354(69443)

Question 601460: 2xsq-12x+10=0
Click here to see answer by jim_thompson5910(35256)

Question 601497: Determine the values of k so that the equation x^2+kx+36=0 will have one real root.please show me step by step.
Click here to see answer by solver91311(24713)

Question 601498: If 2x�-6x=0, then
Click here to see answer by scott8148(6628)

Question 601522: S=3x^2-21x+105 models spending by travelers to a country, in billions of dollars, x years after 2000. what year did travelers spend $75 billion.
Click here to see answer by flame8855(424)

Question 601621: Write a quadratic equation in the variable x having the given numbers as solutions. Type the equation in standard form, ax^2+bx+c=0. Solution: 4,only solution.
Thank you
Click here to see answer by stanbon(75887)

Question 601653: factor the quadratic expression completely, and find the roots of the expression.
66x2 - 130x + 56
Click here to see answer by jim_thompson5910(35256)

Question 601955: b^2-4b+4=0
Click here to see answer by scott8148(6628)

Question 602028: Hi! My Algebra teacher has not been here the past two weeks so I have been teaching myself everything. I can't seen to figure out how to solve equations by completing the square. For example: f^2+3f=88 Thank you!
Click here to see answer by scott8148(6628)

Question 602060: The area of a triangle is 35 square inches. The height of the triangle is 2 inches less than the base. What are the base and height of the triangle? Please help. I am so stuck!
Click here to see answer by josmiceli(19441)

Question 602170: What is the solution of x^2=-6x
Click here to see answer by Alan3354(69443)

Question 602215: Find the side of a square with an area of 90 ft^2
Click here to see answer by jim_thompson5910(35256)

Question 602215: Find the side of a square with an area of 90 ft^2
Click here to see answer by mananth(16946)

Question 602255: I am having trouble solving this equation by either using the quadratic formula, by factoring or by completing the square..
3x^2=15x+10
i have come up with the answer of x=15+- square root of 105/6 is this correct?
email is stonewoodfarms87@aol.com
Click here to see answer by ankor@dixie-net.com(22740)

Question 602468: Two consecutive positive integers such that the square of the second integer added to 4 times the first is equal to 28
Click here to see answer by stanbon(75887)

Question 602468: Two consecutive positive integers such that the square of the second integer added to 4 times the first is equal to 28
Click here to see answer by ewatrrr(24785)

Question 602579: 4x^3+3x^2=64x+48
I tried and ended up with x=16,-16, and -3/4. Is that correct?
Click here to see answer by Alan3354(69443)

Question 602582: Write a quadratic equation having the given numbers as solutions. -4 and -2
Type in standard form.
Click here to see answer by Alan3354(69443)

Question 602582: Write a quadratic equation having the given numbers as solutions. -4 and -2
Type in standard form.
Click here to see answer by jim_thompson5910(35256)

Question 602626: What is the answer to: n2 (n squared) - (minus) n=182 And how do i do it please?
Click here to see answer by scott8148(6628)

Question 602892: the length of a rectangle is 4 centimeters less than triple the width and the area is 32 find the dimensions.
Click here to see answer by flame8855(424)

Question 602965: Use the quadratic formula or completing the square to solve:
3m^2+9m=-2
Click here to see answer by ewatrrr(24785)

Question 603088: Find the vertex of the following quadratic function, and find any intercepts. Also determine the graph of the function.
f(x)= x^2-6x+10
Click here to see answer by lwsshak3(11628)

Question 603181: Determine the coordinates of the�x-intercepts for the quadratic equation 6x2�- 7x�+ 2 = 0.
Click here to see answer by mananth(16946)

Question 603297: If I add the square of a number to the number itself, I get 30. What could the number be? I need the equation!
Click here to see answer by Alan3354(69443)

Question 603440: I don't understand why 2x^2=15-7x has the answer x=-5, 1.5
Click here to see answer by ewatrrr(24785)

Question 603439: I don't understand why 2x^2=15-7x has the answer x=-5, 1.5
Click here to see answer by ewatrrr(24785)

Question 603438: Hello,
I need help please.....
Write a quadratic equation in the variable x having the given numbers as solutions. Type the equation in standard form -√ ̅7, 3 √ ̅7
Thanks so much
Click here to see answer by ankor@dixie-net.com(22740)

Question 603423: Hi,
I am completely lost. I need help with these please.
1) During the first part of a trip, a canoeist travels 63 miles at a certain speed. The canoeist travels 7 miles on the second part of the trip at a speed of 5 mph slower. The total time of the trip is 5 hours. What was the speed on each part of the trip?
2) Write a quadratic equation having the given numbers as solutions -3, -1
Thanks so much
Click here to see answer by ewatrrr(24785)

Question 603470: Hi,
Can someone help me please?
write a quadratic equation in the variable x having the given numbers as solutions. Type the equation in standard form ax^2+bx+c=0.
-√̅10, 6√̅10
Thanks,
Click here to see answer by solver91311(24713)

Question 603515: Can someone give me an example of a problem that a graph would work well on?

Click here to see answer by richwmiller(17219)

Question 603572: what are the cordinates of this equation x^2-x-12=0
Click here to see answer by jim_thompson5910(35256)

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