Questions on Algebra: Quadratic Equation answered by real tutors!

Tutors Answer Your Questions about Quadratic Equations (FREE)

Question 108988: Solve equation by using factoring.
7x^3 - 28x = 0
Click here to see answer by Fombitz(32388)

Question 109004: A rectangle is 5 feet longer than it is wide, and its area is 66 square feet. Find its dimensions.

Click here to see answer by scott8148(6628)

Question 109059: 3x2 + 2x = 7

x2 + 8x+9=-7

Click here to see answer by stanbon(75887)

Question 109003: According to the 1998 Guinness Book of World Records stuntman Dan Koko fell a distance of 355 feet into an airbag after jumping from the Vegas World Hotel and Casino. The distance d in feet traveled by a freefalling object in t seconds is given by the formula d = 16t 2. To the nearest tenth of a second, how long did the stuntman's freefall last?

Click here to see answer by stanbon(75887)

Question 108997: According to the 1998 Guinness Book of World Records stuntman Dan Koko fell a distance of 355 feet into an airbag after jumping from the Vegas World Hotel and Casino. The distance d in feet traveled by a freefalling object in t seconds is given by the formula d = 16t 2. To the nearest tenth of a second, how long did the stuntman's freefall last?

Click here to see answer by ankor@dixie-net.com(22740)

Question 109002: Use the square root property to solve the equation.
7x^3 - 28 x = 0

Click here to see answer by edjones(8007)

Question 109001: Use the square root property to solve the equation.
x^2=4

Click here to see answer by edjones(8007)

Question 108991: Use factoring to solve the equation
6y^2 + 486 = 0
Click here to see answer by edjones(8007)

Question 108998: A rectangle is 5 feet longer than it is wide, and its area is 66 square feet. Find its dimensions.
Click here to see answer by edjones(8007)

Question 106264: Sorry Wrong question
With the equation does a=8 b=0 and c=9?
Thanks
Click here to see answer by vertciel(183)

Question 109154: 1. Please help me solve by factoring:
x2 – 13x = -12

Click here to see answer by scott8148(6628)

Question 109153: 2. Solve using the square root property:
2x2 – 35 = 15

Click here to see answer by scott8148(6628)

Question 109166: find length and width of area 204 perimeter 58
Click here to see answer by ankor@dixie-net.com(22740)

Question 109226: Hi- this is my problem, that I need help with. State the maxium or minimum value of each quadratic function and name the x-value at which this occurs.
f(x)= -2x^2-6x+5
I don't know where to start, sorry!!!
Thank you in advance for you help.
Click here to see answer by jim_thompson5910(35256)

Question 109149: solve using the square root property
2x^2-35=15
Click here to see answer by HyperBrain(694)

Question 109255: Please help me solve by completing the square, and if you can show me that would be great!
4. Solve by completing the square:
x2 + 6x + 1 = 0

Click here to see answer by stanbon(75887)

Question 109282: 1. 5(x - 2)^2=3
2. Find the x-intercepts. y = x^2 + 3x - 8
3. Find the axis of symmetry. "y = x^2 - 5 + 10"
4. Solve. (x � 3)^2 = 6

Click here to see answer by stanbon(75887)

Question 109284: greatly appreciate your help on this question - thank you
Determine the revenue function: a company has found that if they produce x units of a product, they must sell them each at $10 - 0.2x if they are to sell them all.
would revenue function be R(x) = P*q = (10 - 0.2x)*x
and also, their fixed costs are $40 and their Variable costs per unit are $1 Determine the cost and profit functions
Functions are cost = 1(x) + 40 ?
Profit function = total revenue - total cost
= -0.2x^2 + 9x + 40 ?
Am I at all close?
Click here to see answer by stanbon(75887)

Question 109252: 6.Please help me solve using the quadratic formula:
x2 � 7x � 1 = -7

Click here to see answer by edjones(8007)

Question 109283: 1. Solve by completing the square.
x^2 � 4x + 4 = 0
2. Solve by completing the square.
x^2 = 5x + 2
3. Solve by using the quadratic formula. x^2 = �3x + 8
4. Solve by using the quadratic formula. 3x2 = 11x + 4
5. Solve. (x + 1)2 = 3

Click here to see answer by MathLover1(20849)

Question 109237:
Click here to see answer by anne(47)

Question 109346: The height h in feet of an object after t seconds is given by the function
h = �16t2 + 30t + 8. How long will it take the object to hit the ground? Round your answer to the nearest thousandth.

Thanks in advance
Click here to see answer by checkley71(8403)

Question 109388: Solve: x^2 - 4x - 1=0 by completing the square.
Click here to see answer by jim_thompson5910(35256)

Question 109398: Solve by using quadratic formula:
x^2+4x+2=0
This is what I have, not sure if correct?
x=-4+-square root 4^2-4(1)(2) divided by 2
x=-4+-square root 2 divided by 2
x=2 x=-4
Click here to see answer by jim_thompson5910(35256)

Question 109416: I need help with these two prolems:
Solve:x^4-9x^2+18=0
&
Find k so that 4x^2-kx+1=0 has one rational solution.

Click here to see answer by jim_thompson5910(35256)

Question 109323: one positive integer is 7 less than twice another. the sum of their squares is 346. find the integers
i dont understand how to set this up
Click here to see answer by ankor@dixie-net.com(22740)

Question 109473: A pair of skydivers jump out of an airplane 5.5 km. above the ground. The equation H=5500-5t(square)is an approximate model for divers' altitude in meters at t seconds after jumping out of the plane.
If a parachute does not open at 1000m, how much time is left to use the emergency chute?
Click here to see answer by bucky(2189)

Question 109478: a professional stunt performer at a theme park dives off a tower 21m high into the water. his height above the ground at time t seconds is given by the equation h=-4.9^1/2+211
how long does it take to reach the water?
how long does it take to reach the halfway mark?
Click here to see answer by bucky(2189)

Question 109500: X2/3 + 4X1/3 - 12 = 0
Click here to see answer by stanbon(75887)

Question 109530: hi,
i need some help with this problem please. solve the quadratic equation x^2+5x-6=0. thank you so much!!
Click here to see answer by Earlsdon(6294)

Question 109585: I am supposed to find k in the following quadratic equation:
(k+3)x^2 + 2kx + 4 = 0.
I have tried using the quadratic formula and unless I'm doing something wrong I don't come up with k. I have tried using the discriminant to find k with no success. I must be missing something easy.
Thanks for your help, Don
Click here to see answer by jim_thompson5910(35256)

Question 109771: I really need help with this question. The base of an 18-ft ladder is 4 ft away from a wall. How far above the floor is the top of the ladder? Give all answers to the nearest thousandth
Click here to see answer by beccadancer15(3)

Question 109751: factor
L(squared)-16L+60=0
Click here to see answer by jim_thompson5910(35256)

Question 109808: Beatrice and javier can paint a room in 5 hours. Working alone, javier can paint the room in 2 hours less time than Beatrice can. Find how long it takes her to paint the room alone.

Click here to see answer by edjones(8007)

Question 109854: Solve 4x^2=13x+12
Click here to see answer by stanbon(75887)

Question 109854: Solve 4x^2=13x+12
Click here to see answer by Fombitz(32388)

Question 109859: I am really confused at the AC concept. Can someone please help? Thanks!
Use the ac test to determine if x^2 +2x-15 can be factored. Find the values of m and n if it can be factored.
Use the ac test to determine if x^2-3x+7 can be factored. Find the values of m and n if it can be factored.
Click here to see answer by stanbon(75887)

Question 109933: Please explain how to solve the quadratic equation:
3x^2 + 5x = -2
Click here to see answer by stanbon(75887)

Question 109986: y=-1/3(x+l)(x-5)
Click here to see answer by HyperBrain(694)

Question 110036: Help! I need help with a couple of problems.
1. Solve the inequality. Give the solution set in interval notation and graph it. x^2-2x-3>0
-

2.Find the real number c such that x^2-2/3x+c is a perfect square trinomial.
Click here to see answer by edjones(8007)

Question 110059: When a group of bushwalkers become lost they decide to launch a distress flare vertically into the air from the top of a cliff. at the t seconds after firing, the height h metres, of the flare above the water was h=-5t2+30t+35
(i) What was the height of the flare above the water at t=0 seconds?
(ii) How many seconds after firing did the flare reach its maximum height?
(iii) what was the maximun height when the flare was above:
(a) the water
(b) the top of the cliff
Click here to see answer by stanbon(75887)

Question 110077: solve and check:
0=x^2-2x-1

Click here to see answer by MathLover1(20849)

Question 109990: y=-1/3(x+l)(x-5)
Click here to see answer by edjones(8007)

Question 110162: Find an equation that has the solutions: x= -4 and 7
select 1 answer below:
a.x^2 - 3x - 28 = 0
b.x^2 + 3x = 28
c.x^x - 11x = 28
d.x^2 + 3x + 28 = 0
Click here to see answer by checkley71(8403)

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, 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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