Questions on Algebra: Quadratic Equation answered by real tutors!

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Question 119166: A BATTER HITS A PITCHED BASEBALL WHEN IT IS 3 FEET OFF THE GROUND. AFTER IT IS HIT THE HEIGHT (IN FEET) OF THE BALL IS MODELED BY H=-16T^2+80T+3 WHERE T IS THE TIME ( IN SECONDS). HOW LONG WILL IT TAKE THE BALL TO HIT THE GROUND? ROUND TO THE NEAREST HUNDEREDTH. H= 0. MAKE SURE THIS EQUATION IS IN STANDARD FORM.
Click here to see answer by jim_thompson5910(28717)

Question 119248: y2 - 16 = 0
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Question 119248: y2 - 16 = 0
Click here to see answer by edjones(7569)

Question 119250: 5x^2= 100
Click here to see answer by stanbon(57984)

Question 119250: 5x^2= 100
Click here to see answer by edjones(7569)

Question 119276: The relation between the temperature in degrees calsius is equivalent to the temperature in degrees fahrenheit is givin by the funtion F(C)=9C +32.
-
5

Find the temperature in fahrenheit that is equivalent to 13c
Please show all work
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Q24
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Question 119275: The x intercept of the graph of 2x+3y=5 is

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Q23
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Question 119274: The x intercept of the graph of 2x+3y=5 is

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Q23
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Question 119272: Solve the formula for the indicated variable h=7s+1for s

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Q21
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Question 119278: Solve the system of equations using matrices and identify the soluation
2x-3y+11z=10
-2x+2y-7z=6
Please show all work
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Q26
Click here to see answer by Fombitz(13828)

Question 119298: Solve: 4(x-5)^2=-32 I got x=5=+- 2isqrt2 but I'm not sure if I am doing this correctly :)
Click here to see answer by Fombitz(13828)

Question 119298: Solve: 4(x-5)^2=-32 I got x=5=+- 2isqrt2 but I'm not sure if I am doing this correctly :)
Click here to see answer by MaxLiebling(13)

Question 119266: Evaluate the determinant
|c2 a|
|-a c|
Please show all work
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Click here to see answer by Fombitz(13828)

Question 119299: The equation V=12000(0.8)^t describes the value (V) of a car t years after purchase .
a) What was the cars initial value?
b) What was the rate of depreciation expressed as a percentage?
c) What will be the car's value 5 years after it was purchased?
d) Use the graphing calculator to determine the number of years it would take for the car to be worth $824.63 ? Can this part be done without a graphing calculator because I don't have one ?
For (a) I got $12000 , (b) I got 20% (c) I got #3832.16 Please, can someone help me ?
Click here to see answer by stanbon(57984)

Question 119293: What is the value of k if one exact x-intercept of y=x^2+kx+1 is 3+2sqrt2 ?
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Question 119296: What value of 'c' would make x^2+2/3x+c a perfect square trinomial ?
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Question 119294: What is the simplified form of cos30degrees + (sin210degrees)(cos^2 150degrees)?
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Question 119297: What is the standard form for y=1/2x^2+4x-3 ?
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Question 119269: Graph the interval (4,-7) on the number line

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Q 35
Click here to see answer by rapaljer(4667)

Question 119082: please solve this using quadratic equatin with factoring method
m^2/18 - m/6 - 1 = 0
Click here to see answer by ankor@dixie-net.com(15747)

Question 119261: I solved the quadratic equation of 3x^2+11x-20=0 by factoring and have the correct answer of x=4/3, -5. How would I solve graphically by creating a tchart with 6 points that will lie on the parabola. Finding the vertex will be helpful. The graphical work must be sufficient to determine the solutions without knowing them from algebraic work. Any help you can give would be greatly appreciated.
Click here to see answer by Fombitz(13828)

Question 119345: If you could please help me on the steps when using the quadratic equation?
I can identify the A,B and C variables and know the formula. And yet I can never seem to get the right solution. Can you break it down a bit for me? The site helps but it leaves me stuck as soon as I put in the variables. I think the problem is Im unsure how to solve what is going to be squared. If you have absolutely no idea what I'm saying I understand, I am bad at explaining things and would try again. Thank you for your help at any rate.
~S
Click here to see answer by Fombitz(13828)

Question 119411: Use the quadratic formula to solve the equation.
-2x^2+x+8=0
Solve the equation.
x^2+18x+81=25
Simplify (square root of -175) using the imaginary number i.
Click here to see answer by jim_thompson5910(28717)

Question 119461: Solve the equation by extracting square roots - list both the exact solution and the decimal solution rounded to two decimal places.
(x+13)^2 = 25
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Question 119463: Solve:

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Question 119464: Solve:

Click here to see answer by MathLover1(6815)

Question 119488: original problem: 5x^2-30x+40=0
work:
5x^2-30x=-40
x^2-6x=-8
x^2-6x+9=-8+9
Please help. I keep getting lost. Could you show me how to work this problem step by step? I already have the answer, so I'm not looking for that, just how to do it. The answer is x=2, x=4
Click here to see answer by stanbon(57984)

Question 119491: A quadratic function h(x) has zeros at 4 and -3 and a y intercept of -12. The function h(x) is translated -3 units on the x axis. Which of the following equations represents g(x), the transformed h(x)?
a. g(x) = x^2 - 5x
b. g(x) = x^2 + 7x
c. g(x) = x^2 -x -15
d. g(x) = x^2 + 5x - 6
Click here to see answer by stanbon(57984)

Question 119529: determine whether the equation has 2 solutions, 1 solution, or no solution. SHOW WORK! PUT IN STANDARD FORM!
22)x^2-3x+2=0
24)-3x^2+5x-1=0
26)x^2-2x+4=0
28)3x^2-6x+3=0
30)-5x^2+6x-6=0
Click here to see answer by jim_thompson5910(28717)

Question 119610: A collector's coin originally purchased for $3 in 1994 is expected to double in value by the year 2004. Write the equation of an exponential function to model this situation.Explain your answer.
Click here to see answer by stanbon(57984)

Question 119663: What are the roots of (4x-3)^2=36?
Click here to see answer by MaxLiebling(13)

Question 119675: Find the constant term that should be added to make the following expression a perfect-square trinomial.
x^2 – 6x
Find the constant term that should be added to make the following expression a perfect-square trinomial. x^2 + 7x
Click here to see answer by checkley71(8403)

Question 119662: One root of x^2-4x+4a=0 is 2-4i. What is the value of a ?
Click here to see answer by jim_thompson5910(28717)

Question 119661: What is the value of k if one root of (3k+1)x^2-2kx=-5 is 1?
Click here to see answer by jim_thompson5910(28717)

Question 119666: What is the range for 3(y+2)= (x-4)^2?
Click here to see answer by Fombitz(13828)

Question 119765: Solve using the quadratic formula please:

Please help me with step by step instructions to help me understand.
Thank you in advance!
C
Click here to see answer by Caallen2(9)

Question 119768: Solve by factoring:
x^2-9x=-20
Thanks in advance!
C
Click here to see answer by Caallen2(9)

Question 119766: Solve using the quadratic formula please:
x^2-3x-23=5
Please provide step by step instructions to help me understand.
Thanks!
C
Click here to see answer by Caallen2(9)

Question 119665:
What is the sum of the roots of the quadratic equation 2x^2-x=4?
Click here to see answer by checkley71(8403)

Question 119954: Where would the discriminant be in this problem: x2(exponent)+3x-2=0
Click here to see answer by jim_thompson5910(28717)

Question 120039: Find the quadratic equation with roots -1+4i and -1-4i.
The correct answer is x^2 + 2x + 17 = 0 according to my teacher.
Is this answer wrong because everytime I try to solve the problem, I do not get that answer.
If it is right, please explain how.
Click here to see answer by bucky(2189)

Question 120043:
x^2-(x-4)
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, 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