Question

X^2-9 The expression above is equivalent to which of the following?

x−3

(x+3)^2

(x+3)(x−3)

(x−3)^2

Answer 1

Your answer would be (x+3)(x-3).
Using the foil method to simplify an equation, you would multiply x by x, 3 by 3 and so on.
Hope this helps!