Find the product.

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

-d2 - 16

d2 - 16

d2 + 16

d2 - 8d - 16

(-d + 4) (-d - 4) = 0

-d (-d - 4) + 4 (-d - 4) = 0

d² + 4d - 4d - 16 = 0

d² - 16 = 0 2nd choice.

We can find the value of d.

d² - 16 = 0

d² = 16

√d² = √16

d = 4

to check:

(-4+4) (-4 - 4) = 0

0 (-16) = 0

0 = 0

Multiplication property of 0. Any number multiplied by 0 is equal to 0.