(b+4)(b-4)=

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

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

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

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

Multiply (4 + b) * (-4 + b)
(4(-4 + b) + b(-4 + b)) = 0
((-4 * 4 + b * 4) + b(-4 + b)) = 0
((-16 + 4b) + b(-4 + b)) = 0
(-16 + 4b + (-4 * b + b * b)) = 0
(-16 + 4b + (-4b + b2)) = 0

Combine like terms: 4b + -4b = 0
(-16 + 0 + b2) = 0
(-16 + b2) = 0

Solving
-16 + b2 = 0

Solving for variable 'b'.

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

Add '16' to each side of the equation.
-16 + 16 + b2 = 0 + 16

Combine like terms: -16 + 16 = 0
0 + b2 = 0 + 16
b2 = 0 + 16

Combine like terms: 0 + 16 = 16
b2 = 16

Simplifying
b2 = 16

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