Posted by **HELP ME** on Monday, November 30, 2009 at 5:56pm.

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 -
**Ms. Sue**, Monday, November 30, 2009 at 6:00pm
http://www.jiskha.com/display.cgi?id=1259619516

- algebra 2 -
**Damon**, Monday, November 30, 2009 at 6:30pm
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)

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