Question

What are the factors of x2 − 64?

A. Prime
B. (x − 4)(x + 16)
C. (x − 8)(x − 8)
D. (x + 8)(x − 8)

Answer 1

D

Explanation:

Answer 2

x^2 - 64 uses the algebraic identity of a^2 - b^2
so x^2 - 64 = x^2 - 8^2 = (x - 8)(x + 8)
thus the answer should be D (not sure if i'm correct !)