Question

Factor the expression below.

x^2-64
a. (x+8)(x-8)
b. (x-8)(x-8)
c. (x+16)(x-4)
d. (x-16)(x-4)

Answer 1

A. (x+8)(x-8)

Because 64 factored is 8x8 and to get a net you need a positive and negative. And X^2 factored is just two X’s.

Answer 2

a

Explanation:

a² - b² = (a +b)(a - b)

64 = 8 * 8 = 8²

x² - 64 = x² - 8²

= (x +8)(x - 8)