What value completes the square for the expression x^2+16x

64

8

-64

-8

You have the expression x^2+16x. Then, to find the value that completes the square for it, you must apply the following proccedure:

x^2+16x=0

x^2+16x+0=0

This quadratic equation needs to have the following form:

a (x+d) ^2+e

Then, you have:

(b/2) ^2 = (16/2) ^2 = (8) ^2=64

Therefore, the expression is:

x^2+16x+64=64

(x+8) ^2=64

The answer is the first option = 64