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

Solution for (f+4)(f-4)=0 equation:

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

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

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

Multiply (4 + f) * (-4 + f)
(4(-4 + f) + f(-4 + f)) = 0
((-4 * 4 + f * 4) + f(-4 + f)) = 0
((-16 + 4f) + f(-4 + f)) = 0
(-16 + 4f + (-4 * f + f * f)) = 0
(-16 + 4f + (-4f + f2)) = 0

Combine like terms: 4f + -4f = 0
(-16 + 0 + f2) = 0
(-16 + f2) = 0

Solving
-16 + f2 = 0

Solving for variable 'f'.

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

Add '16' to each side of the equation.
-16 + 16 + f2 = 0 + 16

Combine like terms: -16 + 16 = 0
0 + f2 = 0 + 16
f2 = 0 + 16

Combine like terms: 0 + 16 = 16
f2 = 16

Simplifying
f2 = 16

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