Question

What valur completes the square for x^2+2x?

Answer 1

x^2+2x+1
(x+1)(x+1)

Answer 2

x^2+2x = 0
To complete the square
get coefficient of x and divide it by 2 then square it
2 divided by 2 =1 then squared = 1
Add to both sides of the equation:
x^2+2x +1 = 1
(x+1)*(x+1) = 1
x1=0
x2=-2

To read about completing the square, go here:
http://www.1728.org/quadr2.htm

Answer 3

@shahmad

As I understand the question, the task is to give the number required to make
x^2+2x into a perfect square trinomial.

As @wolf1728 stated, do this to find that number:

"To complete the square get coefficient of x and divide it by 2 then square it 2 divided by 2 =1 then squared = 1"

So, the answer is simply 1. -->

There is no equation to solve; there was no equation given in the posted problem.