Question

(x + 4)(x-4)
using foil

Answer 1

`x^(2) - 16\\`

Explanation:

FOIL stands for first, outer, inner, last. That means we multiply sets of terms together in that order.

(x+4)(x-4)

first:
`x^(2)`

(x+4)(x-4)

outer: -4x

(x+4)(x-4)

inner: 4x

(x+4)(x-4)

last: -16

Add these all together.

x^2 - 4x + 4x - 16

Simplify the middle terms.

`x^(2) - 16\\`