SOLUTION: Solve by completing the square. Identify your good C value. x^2+8x+16=36

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: Solve by completing the square. Identify your good C value. x^2+8x+16=36      Log On


   

Question 880174: Solve by completing the square. Identify your good C value.
x^2+8x+16=36
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
The left side is a perfect square already, as is too the right side. You would take %288%2F2%29%5E2=4%5E2=16 which is already present on the left side member.

%28x%2B4%29%5E2=36
x%2B4=0%2B-+sqrt%2836%29
x%2B4=0%2B-+6
x=-4%2B-+6
-
x is 2 or -10.

You can manage the given quadratic equation as
x%5E2%2B8x%2B16-36=0
x%5E2%2B8x-20=0
and you can identify your c from ax%5E2%2Bbx%2Bc=0 as c=-20.