(x - 2)(x + 2) (x² + 2x - 2x - 4) x² - 4

Using FOIL (First, Inside, Out, Last), you have to multiply. First: multiply x and x Outside: Multiply x and +2 Inside: Multiply -2 and x Last: Multiply -2 and +2. Finally, add it all together, and you will get x^2-4