Questions on Algebra: Quadratic Equation answered by real tutors!

Tutors Answer Your Questions about Quadratic Equations (FREE)

Question 610753: Can someone help me solve this problem? Thank you so much!
Solve x² + 4x – 7 = 0 by completing the square. How many solutions are there?

Click here to see answer by scott8148(6628)

Question 610920: 14x^2+9x+1=0
Click here to see answer by jim_thompson5910(28699)

Question 611153: A firecracker shoots up from a hill 140 feet high with an initial speed of 100 feet per second. Using the
formula , approximately how long will it take the firecracker to hit the ground?
Multiple choice : a) 5 seconds, b) 7seconds, c) 9 seconds, d) 11 seconds.
Click here to see answer by Alan3354(31505)

Question 611159: 1. Which of the following is a quadratic equation that has roots of 2 1/2 and 2/3?
A) 5x^2 + 11x - 7 = 0
B) 6x^2 - 19x + 10 = 0
C) 5x^2 + 11x - 10 = 0
D) 6x^2 + 19x - 10 = 0

14. Solve by completing the square x2 - 6x - 4 = 0.
21. Solve by completing the square x2 - 2x - 5 = 0.

25. Solve by completing the square 3x2 - 8x - 6 = 0.

26. Solve the quadratic equation x2 + 8x + 12 = 0.

Click here to see answer by Alan3354(31505)

Question 611361: whats the answer to 5(x+6)^2=80 using the square root method
Click here to see answer by jim_thompson5910(28699)

Question 611361: whats the answer to 5(x+6)^2=80 using the square root method
Click here to see answer by stanbon(57953)

Question 611361: whats the answer to 5(x+6)^2=80 using the square root method
Click here to see answer by ewatrrr(10682)

Question 611359: whats the answer to 5(x+6)^2+80 using the square root method
Click here to see answer by solver91311(17070)

Question 611369: whats the answer to x2=8x+2 using the quadratic formula
Click here to see answer by jsmallt9(3296)

Question 611378: how do I rewrite the quadratic equation x^2+6x-8 in vertex form?
Click here to see answer by solver91311(17070)

Question 611378: how do I rewrite the quadratic equation x^2+6x-8 in vertex form?
Click here to see answer by stanbon(57953)

Question 611390: How would I solve the equation 2t^2+8t-64=0 using the Factoring Method?
I've gotten the problem down to 2(t-4)(x+8) but then sort of crashed...
Click here to see answer by jim_thompson5910(28699)

Question 611543: I am really stumped here and have gotten so confused. the question is
If 4n^2+25=-20x what is the value of the discriminant, AND can you please state the number and type of roots/solutions/zeros.
Thanks so much!!
KF
Click here to see answer by ewatrrr(10682)

Question 611559: 4n^2+25=-20x I need to find the value of the discriminant as well as I need to state the number and types of roots/solutions/zeros. Thanks a lot-I am so confused!!!
anonymous

Click here to see answer by richwmiller(9144)

Question 611576: the problem is 4n^2+25=-20x. What is the value of the discriminant and please state the number and typs of roots/solutions/zeros? Please show your work as well. I think that I following the following a + b+ c+= a is 4^2+b which is 20+c which is 25=0. I am so confused I am not even sure if that is right. If you could do this and show all work it is greatly appreciated.

Click here to see answer by stanbon(57953)

Question 611586: I thought I was getting the hang of this but definitely not sure now-
x^2-16x+4=0. Please show your work PLEASE! I need the value of the discriminate, give the number and the number of roots/solutions/zeros. I thought that I was to ad x^2+16+4 but I am so confused that I don't even know any more.
Again please show your work so that I may understand the processes involved.
Click here to see answer by Edwin McCravy(8999)

Question 611680: The volume of a rectangular Chinese box is given by the formula V= LWH. The volume of the box shown to the right is 594 cu. Units. Find the Length and Width.
Click here to see answer by solver91311(17070)

Question 611906: If f(x)=x^3 & g(x)=x+5, which is equivalent form of f(g(x))?
Click here to see answer by jim_thompson5910(28699)

Question 611909: Find the x-intercept(s) and the coordinates of the vertex for the parabola y = x^2-2x-8. If there is more than one x-intercept, separate them with commas.

Click here to see answer by lwsshak3(6751)

Question 612122: Plz Evaluate alpha minus beta in the quadratic equation
Click here to see answer by richard1234(5390)

Question 612193: You buy 50 feet of fence material, you plan to plant a garden within the fence,
and you are going to get some fertilizer. One bag of fertilizer covers 500 square feet, you decide that you want to make your garden so that one bag of fertilizer is just enough.
what length do you make the first side of your fence?
Click here to see answer by richwmiller(9144)

Question 612220: a ball is thrown at the height of 3m with the speed of 4m/s. find the quadratic equation.
Click here to see answer by stanbon(57953)

Question 612240: please please help me! i know the quadratic formula, but what i dont understand is what do you do if there is no 'b' for the quadratic formula? for example:
normal formula:
ax2+bx+c
question
4p2-36=0
Click here to see answer by bucky(2189)

Question 612371: -x^2-8x-12
Click here to see answer by lynnlo(4169)

Question 612355: ,leaving the answer in simplest
radical form.
A. ^8sqrt(x^3)
B. ^18sqrt(x)
C. ^9sqrt(x^2)
D. ^3sqrt(x)
Hope you can understand....
Click here to see answer by lynnlo(4169)

Question 612138: please solve this problem by completing the square

Click here to see answer by jsmallt9(3296)

Question 612304: a ball thrown from the height of 3m with the speed of 4m/s. find quadretic equation.i got answer -9.8t^2+4t+3but i donot understand how -9.8
Click here to see answer by nerdybill(7003)

Question 612400: -3x^2-30x+72
Click here to see answer by lynnlo(4169)

Question 612460: Which is the first incorrect step to solving

Step 1:
Step 2:
Step 3:
Step 4:
I need to know which is the first incorrect step.
Click here to see answer by Edwin McCravy(8999)

Question 612465: A certain population of a city increases according to the model
P(t) = 250e^0.47t
with t=0 corresponding to the year 1992, where t is in years.
Which of thr following equations expresses the population present
in the year 2000?
A. P(2000) = 250e^0.47(2000)
B. P(1992) = 250e^0.47(1992)
C. P(6) = 250e^0.47(6)
D. P(8) = 250e^0.47(8)
Hope somebody can help.
Click here to see answer by solver91311(17070)

Question 612545: Which expression represent f(g(3)). If f(x)=3-x^2 & g(x)=1+2x?
A.25
B.1
C.-46
D.-11
Plz Help..
Click here to see answer by jim_thompson5910(28699)

Question 612551: If f(x)=x^2-5x+8 & g(x)=x^2-4, which is an equivalent form of g(x)+f(x)?
A.x^2-5x+4
B.2x^2-5x-4
C.2x^2-5x+4
D.2x^2+5x+4
Your Help We Be Appreciated.

Click here to see answer by jim_thompson5910(28699)

Question 612554: If f(x)=x^2-3 & g(x)=x+5, which is equivalent form of f(g(x))?
A.x^2+10x+22
B.x^3+5x^2-3x-15
C.x^2+2
D.x^2+x+2
Can someone plz answer.
Click here to see answer by jim_thompson5910(28699)

Question 612555: If f(x)=2x^2 & g(x)=3x^4, which is equivalent form of f(x)*g(x)?
A.6x^8
B.5x^6
C.6x^6
D.5x^8
Click here to see answer by jim_thompson5910(28699)

Question 612719: 65sq units what is the base & height?
Click here to see answer by Alan3354(31505)

Question 612723: I am very confused by the problem below, mostly once you get the common denominator. What do you do after you get that to complete the problem? We were shown an example, but it was not very explanatory. Any helpful tips would be much appreciated. Thanks!!!
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During the first part of a trip, a canoeist travels 49 miles at a certain speed. The canoeist travels 4 miles on the second part of the trip at a speed of 5 mph slower. The total time for the trip is 2 hours. What was the speed on each part of the trip?

Click here to see answer by scott8148(6628)

Question 612736: How to factorise x³ - 49xy²
Click here to see answer by Edwin McCravy(8999)

Question 612740: If f(x)=(x^2-5x+4) & g(x)=x^2+4x-5, which is the first incorrect step in simplifying 3f(x)-g(x)?
Step 1: 3(x^2-5x+4)-(x^2+4x-5) (Substitution)
Step 2: 3x^2-15x+12-x^2-4x+5 (Distributive Property)
Step 3: 2x^2-11x+17 (Combine Similar Terms)
A.Step 1
B.Step 2
C.Step 3
D.No error
Click here to see answer by richard1234(5390)

Question 612754: If f(x)=x^2-5x+8 & g(x)=x,which is an equivalent form of g(x)/f(x)?
A.x-5
B.1/x-5
C.x/x-5
D.-1/5
Help.
Click here to see answer by jsmallt9(3296)

Question 613004: Use graph to estimate roots of this quadratic equation:
-x^2+3x-2=0
Click here to see answer by ewatrrr(10682)

Question 612998: y=-3x^2+x+1
Click here to see answer by KMST(1936)

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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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