Question

Find the product.

(-d + 4)(-d - 4)

Answer 1

`d^2 -16`

Explanation:

(-d + 4)(-d - 4)

Apply FOIL method to multiply it

First multiply -d inside the second parenthesis -d-4

`-d * -d = d^2`

`-d *(-4)= 4d`

`4 * (-d) = -4d`

`4 * (-4)= -16`

Now combine all the terms

`d^2 +4d -4d -16`

`d^2 -16`