1 Answer

Valdars · Answer 1 · 2017-06-14T06:46:31+0000

You use FOIL

First
Outer
Inner
Last

(-x - 4)(x + 4)

The first terms for both are -x and x

-x * x = -x^2

Outer are -x and 4

-x * 4 = -4x

Inner are -4 and x

-4 * x = -4x

Last are -4 and 4

-4 * 4 = -16

Combine:

-x^2 - 4x - 4x - 16

-x^2 - 8x - 16

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