Question

use identity to find the product (x+3)(x-3)

Answer 1

(x+3)(x-3)

We know that (a+b) (a-b) = a^2 - b^2

So,

(x+3)(x-3) = x^2 - (3)^2

= x^2 - 9

Answer 2

$(a + b)(a - b) = {a}^{2} - {b}^{2}$
$(x + 3)(x - 3) = {x}^{2} - {3}^{2} \\ {x}^{2} - 9$
Hope it will help you.