(d-4)(d+4)=

Solution for (d-4)(d+4)= equation:

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

Reorder the terms:
(-4 + d)(d + 4) = 0

Reorder the terms:
(-4 + d)(4 + d) = 0

Multiply (-4 + d) * (4 + d)
(-4(4 + d) + d(4 + d)) = 0
((4 * -4 + d * -4) + d(4 + d)) = 0
((-16 + -4d) + d(4 + d)) = 0
(-16 + -4d + (4 * d + d * d)) = 0
(-16 + -4d + (4d + d2)) = 0

Combine like terms: -4d + 4d = 0
(-16 + 0 + d2) = 0
(-16 + d2) = 0

Solving
-16 + d2 = 0

Solving for variable 'd'.

Move all terms containing d to the left, all other terms to the right.

Add '16' to each side of the equation.
-16 + 16 + d2 = 0 + 16

Combine like terms: -16 + 16 = 0
0 + d2 = 0 + 16
d2 = 0 + 16

Combine like terms: 0 + 16 = 16
d2 = 16

Simplifying
d2 = 16

Take the square root of each side:
d = {-4, 4}