Question

Find the product of (x + 3)(x − 3).

x2 − 6x + 9

x2 + 6x + 9

x2 + 9

x2 − 9

Answer 1

use difference of two squares formula

(a-b)(a+b) = a^2 - b^2

so (x + 3)(x − 3) = x2 − 9