Question

Which expression is equivalent to x2 - 9?

A (x – 3)
B (x – 3)(x– 3)
C (x − 3)(x + 3)
B (x + 3)(x + 3)

Answer 1

C

Explanation:

x*x= x^2

-3*(+3)=-9

2x-9

Answer 2

Answer: C. (x-3)(x+3)

Step-by-step explanation: Since both terms are perfect squares, factor using the difference of squares formula a^2-b^2=(a+b)(a-b) where a=x and b=3.

Hope this helps you out! ☺