Question

What are the factors of x^2-81

A.) (x+9) (x-9)

B.) (x-9) (x-9)

C.) (x+3) (x-27)

D.) prime

Answer 1

A.) (x+9) (x-9)

Explanation:

x² - 81

x² - 9²

(x - 9)(x + 9)

Answer 2

A. x-9 and x+9 because these are perfect squares. 9 times -9 is -81. x times x is x^2. 9 + -9 is 0

Explanation: