# algebra 2

posted by .

how do you solve quadratic equations by finding square roots

i have no clue how to do this. I have fallen behind in my math class because my teacher is horrible. I need to learn this to understand everything in the section in the section. I beg someboody to answer this question. i don't want any replys like figure it out yourself or coments like ms. sue has ben posting as `answers'.Pleeaseeeeee!

<3 converse

algebra 2
an addition to my question, how would you solve somthing like 2(radical sign)2

• algebra 2 -

http://www.jiskha.com/display.cgi?id=1259619516

• algebra 2 -

perhaps you mean by using the quadratic equation:
if
a x^2 + b x + c = 0
a,b, c constant, x variable
then
x = [-b +/- sqrt (b^2-4ac) ] / ( 2 a )

You can prove that by completing the square
x^2 + (b/a) x = -c/a
x^2 +(b/a) x + (b/2a)^2 = -c/a + b^2/4a^2

(x+b/2a)^2 = -4ca/4a^2 + b^2/4a^2
x + b/2a = (1/2a)sqrt( b^2 - 4ac)

## Similar Questions

1. ### algebra help

My class is doing a unit on the "completing the square method" which is used to solve quadratic equations. I need help understanding this method. It's not making any sense right now! I have two problems and I need to figure out which …
2. ### Algebra2

Find the polynomials roots to each of the following problems: #1) x^2+3x+1 #2) x^2+4x+3=0 #3) -2x^2+4x-5 #3 is not an equation. Dod you omit "= 0" at the end?
3. ### Algebra 2

How do I solve this quadratic function by finding square roots 2x²=200 ?

How do I solve this quadratic function by finding square roots 2x²=200 ?
5. ### algebra 2

how do you solve quadratic equations by finding square roots
6. ### algebra 2

how do you solve quadratic equations by finding square roots i have no clue how to do this. I have fallen behind in my math class because my teacher is horrible. I need to learn this to understand everything in the section in the section. …
7. ### Math

5y(squared) + 4 = 14 solve quadratic equations by finding square roots
8. ### Alg 1 quadratic equations

I'm doing quadratic equations x^2 +bx+c =0. I know how to questions like x^2 +17x +42 =0 but this one says, j^2-9jk-10k^2. I have no clue on what I need to do
9. ### Math

I can't remember how you find the roots of quadratic equations other than determining the zeroes of the equation and finding the x-intercepts. Can someone please give me a clear answer on this as my dad has been useless on this topic …
10. ### Algebra

Factor quadratic expressions: 2x^2 + 9x + 4 10x^2 + 70x + 100 Solve quadratic equations by factoring: 2x^2 + 9x + 4 = 0 Solve by taking square roots: (x - 5)^2 - 81 = 0

More Similar Questions