Question

How do you multiply `(x + 2)( x − 2)`?

Answer 1

Use FOIL(first, outer, inner, last) if you are not sure, but you can also use this "squared the first, squared the last"( -2x+2x cancel out). Watch for the signs.

Explanation:

`(x+2)(x-2)`
`x^2 -2x+2x-4`
`x^2-4`