x2 – 3x – 18

This is a quadratic expression that can be factored as:

(x - 6)(x + 3)

To check, you can use the FOIL method:

(x - 6)(x + 3) = x^2 + 3x - 6x - 18 = x^2 - 3x - 18

Therefore, the factored form of the expression x^2 - 3x - 18 is (x - 6)(x + 3).