Question

What value should be added to make a perfect square? x^2+16x

a. 4
b. 8
c. 16
d. 64

Answer 1

D. 64

Explanation:

What added together equals 16? 8.

You will then times 8*8=64.

64 is your answer.

Answer 2

d. 64

Explanation:

x^2+16x

The coefficient of the x term is 16

Divide by 2

16/2 =8

Then square it

8^2 = 64

We add 64

x^2 +16x +64

(x+8)^2