SOLUTION: solve the equation for x x^2+4x+4=7

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Question 98785: solve the equation for x
x^2+4x+4=7
Answer by malakumar_kos@yahoo.com(315) About Me  (Show Source):
You can put this solution on YOUR website!

solve the equation for x
x^2+4x+4=7
x^2+4x+4-7 =0
x^2+4x-3 = 0 compare with the std form we get a= 1 ,b = 4 and c= -3
use the formulax+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+

x = -4 +- sq.rt (4^2+12)/2
= -4+-sq.rt28/2
= -4+-2 sq.rt 7/2
= 2(-2+-sq.rt 7)/2
x = -2+-sq.rt 7