Questions on Algebra: Quadratic Equation answered by real tutors!

Tutors Answer Your Questions about Quadratic Equations (FREE)

Question 541980: what is x squared - 2x - 13= 0
Click here to see answer by Alan3354(69443)

Question 541963: The question from my book says that "the radicand of the quadratic formula, b^2 - 4ac, can be used to determine whether has solutions that are rational, irrational, or not real numbers." I haven't been able to solve the problem on this website because it's saying that the first coefficient is zero. It's also asking me to explain how this works. And if it possible to determine the kinds of answers that one will obtain to a quadratic equation without actually solving the equation. I would greatly appreciate any help I can get.
Click here to see answer by josmiceli(19441)

Question 542089: If I had a question like this: f(x)= 2(x-4)^2-2, what would I have to do with the 2 left of the parentheses? I understand how to do the rest, I had only forgotten what I was supposed to do with that. Please help =)
Click here to see answer by Alan3354(69443)

Question 542149: x^2-6x+9=0
Click here to see answer by jim_thompson5910(35256)

Question 542429: Determine the quadratic function,F(x)=a^2+bx+c , whose vertex is (3, 7) and passes through the point (5, -9).
Click here to see answer by KMST(5328)

Question 542571: Solve the equation by making an appropriate substitution.
x-512-16sqrtx=0
here is what I have tried:
x^1-16x^1/2-512
(x^1/2)^2-16^1/2-512
subsitute x for u
u^2-16u-512
factor (I cannot find a factor for this problem so I divide everything by 2)
u^2-8u-256
using the formula
8 +-sqrt8^2-4(1)(256)/2(1)
8 +-sqrrt1088 / 2
reduced
4+12sqrrt17, 4-12sqrrt17
my answer choices are
{768}
{2068}
{1024}
{512}

Click here to see answer by Earlsdon(6294)

Question 542384: Two numbers differ by 7,the different of their squares is 91,find the numbers.
Click here to see answer by ankor@dixie-net.com(22740)

Question 542812: (-8v^2+3v+3)-(6v^2+3)
Click here to see answer by rfer(16322)

Question 542915: what is 7x-5+12^2=3x using the quadratic formula
Click here to see answer by pinkgal(1)

Question 542994: radical -5 * radical -2
type answer in a+bi form ..use radicals as needed.
Thank you!
Click here to see answer by ankor@dixie-net.com(22740)

Question 543368: (2x-5)^2+4(2x-5)+3=0
Click here to see answer by stanbon(75887)

Question 543370: (2x-5)^2+4(2x-5)+3=0
I am looking for details on this problem. I tried to follow my video instructor and get lost right off the bat Thanks
Click here to see answer by stanbon(75887)

Question 543446: Solve the polynomial inequality and graph the solution set on a number line. Express the solution set in interval notation.
(x+3)(x-3)(x-5)<0
Click here to see answer by lwsshak3(11628)

Question 543547: x^2+20=10x
Click here to see answer by IFY(62)

Question 543570: 2x^2+x=-1
Click here to see answer by IFY(62)

Question 543613: x^2-2/5x+1/25
Click here to see answer by josmiceli(19441)

Question 543578: SOLVE::
3x=5x+6/2x-3
Click here to see answer by rfer(16322)

Question 543643: How do you find or factor this quadratic expression x^2-13x+12
Click here to see answer by Alan3354(69443)

Question 543688: Solve this problem by completing the square show your work: 3x^2 - 12x + 11 = 0
This is what I have done:
3(x^2 - 4x + 4) = -11
3(x^2 - 4x + 4) = -11 + 12
3(x^2 - 4x + 4) = 1
(x^2 - 4x + 4) = 1/3
(x - 2)^2 = 1/3
(x - 2) = (1/3)^1/2
x = 2 +- (1/3)^1/2
But the answer in the back oh my book reads x = 2 +- (square root of 3) / 3
Click here to see answer by Earlsdon(6294)

Question 543969: r^2=9
Click here to see answer by umnikmo(75)

Question 544053: the area of a pond is 44 square meters. what is the radius?
Click here to see answer by JBarnum(2146)

Question 544108: Use the quadratic formula to solve the equation.
5x^2 + 12x + 3 = 0
here is what I have tried
5x^2+12x=-3
12/2 = 6^2 = 36
5x^2+12x+36=-3+36
5x^2+12x+36=33
factor
5(x+6)(x+6)=33
5(x+6)^2=33
5x+180=33
5x=-147
5x/5=-147/5
I am lost from here

Click here to see answer by richwmiller(17219)

Question 544789: Multiply
3x + 3
by
-4x2 + 4x � 2 (Points : 20)

Click here to see answer by rfer(16322)

Question 544834: Use the discriminant to determine whether the following equations have solutions that are: two different rational solutions; two different irrational solutions; exactly one rational solution; or two different imaginary solutions.
8x2 + 2x + 4 = 0 (Points : 10)
Two different irrational solutions
Two different imaginary solutions
Exactly one rational solution
Two different rational solutions

Click here to see answer by stanbon(75887)

Question 544765: a ball is thrown straight up from a rooftop 240ft high. The ball misses the rooftop on the way down.When will the ball be at 120 ft. identify solution on a graph h=-16t^2+56t+240
Click here to see answer by stanbon(75887)

Question 544832: Use polynomial long division to divide
12x3 � 9x2 + 13x + 4
by
3x2 � 3x + 4 (Points : 20)

Click here to see answer by saifoo.khan(162)

Question 544831: Multiply
3x + 3
by
-4x2 + 4x � 2 (Points : 20)

Click here to see answer by saifoo.khan(162)

Question 544787: Use polynomial long division to divide
12x3 � 9x2 + 13x + 4
by
3x2 � 3x + 4 (Points : 20)

Click here to see answer by mananth(16946)

Question 544882: write a quadratic function in standard form for the given set of zeros: -5 and 4.
Click here to see answer by Earlsdon(6294)

Question 544350: how do we translate y=x^ to get a graph of y=(x-4)^ ??
Click here to see answer by jim_thompson5910(35256)

Question 544272: write a quadratic function using 5 and 3
Click here to see answer by jim_thompson5910(35256)

Question 545103: express in terms of i 2square root -36
Click here to see answer by jim_thompson5910(35256)

Question 545038:
what is the graph for ?
The vertex is (0, -7), and the axis of symmetry is x=0.
Click here to see answer by Earlsdon(6294)

Question 545297: Solve the equation.
2p^3 - 7p^2 - 50p + 175 = 0
I tried factoring out a p and then FOILing the remaining part while ignoring the " + 175 " part, but it didn't work. :(
Click here to see answer by jim_thompson5910(35256)

Question 545459: x^2+40x-45=0
Click here to see answer by jim_thompson5910(35256)

Question 545446: use the quadratic formula to solve:3x^2+2x-4=0?
A)x=-1
B)x=sqrt(13)
C)x=-1-sqrt(13)
D)x=-1/3
E)=-1+sqrt(13)/3
Click here to see answer by jim_thompson5910(35256)

Question 545461: solve (x-3)(x+2)=x+2

thank you
Click here to see answer by josmiceli(19441)

Question 545590: give exact and approximate solution to three decimal places
x^2+14x+49=1

Click here to see answer by jerryguo41(197)

Question 545464: factor completely: a^2p^2 + q^2-p^2 - a^2q^2

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

Question 545713: andy's average driving speed for a 4 hour trip was 45 miles per hour. during the first 3 hours he drove 40 miles per hour. what was his average speed for the last hour on his trip?

Click here to see answer by smmoore(10)

Question 545788: 2x+√x+1=8
Click here to see answer by saifoo.khan(162)

Question 545791: 1\x-1=x\x+1
Click here to see answer by saifoo.khan(162)

Question 545809: solve for x: x^2-x=7
Click here to see answer by JBarnum(2146)

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