(4r+4)(4r-4)=

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

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

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

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

Multiply (4 + 4r) * (-4 + 4r)
(4(-4 + 4r) + 4r * (-4 + 4r)) = 0
((-4 * 4 + 4r * 4) + 4r * (-4 + 4r)) = 0
((-16 + 16r) + 4r * (-4 + 4r)) = 0
(-16 + 16r + (-4 * 4r + 4r * 4r)) = 0
(-16 + 16r + (-16r + 16r2)) = 0

Combine like terms: 16r + -16r = 0
(-16 + 0 + 16r2) = 0
(-16 + 16r2) = 0

Solving
-16 + 16r2 = 0

Solving for variable 'r'.

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

Add '16' to each side of the equation.
-16 + 16 + 16r2 = 0 + 16

Combine like terms: -16 + 16 = 0
0 + 16r2 = 0 + 16
16r2 = 0 + 16

Combine like terms: 0 + 16 = 16
16r2 = 16

Divide each side by '16'.
r2 = 1

Simplifying
r2 = 1

Take the square root of each side:
r = {-1, 1}