Answer:

x² - 4

Step-by-step explanation:

Using foil method:

(x + 2) (x - 2)

x × x = x²

x × -2 = -2x

2 × x = 2x

2 × -2 = -4

It'll look like this:

x² - 2x

2x - 4

-----------------

x² - 4 ✓