Question

What are the factors of x2 - 64?

01) Prime
2) (x - 4)(x + 16)
3) (x-8)(x - 8)
4) (x + 3)(x – 8)

Answer 1

Answer should be (x + 8)(x - 8)

Answer 2

Explanation:

Remembee that a² - b² = (a + b)(a - b)

Therefore x² - 64 = (x + 8)(x - 8).