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

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

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

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

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

Multiply (-4 + s) * (4 + s)
(-4(4 + s) + s(4 + s)) = 0
((4 * -4 + s * -4) + s(4 + s)) = 0
((-16 + -4s) + s(4 + s)) = 0
(-16 + -4s + (4 * s + s * s)) = 0
(-16 + -4s + (4s + s2)) = 0

Combine like terms: -4s + 4s = 0
(-16 + 0 + s2) = 0
(-16 + s2) = 0

Solving
-16 + s2 = 0

Solving for variable 's'.

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

Add '16' to each side of the equation.
-16 + 16 + s2 = 0 + 16

Combine like terms: -16 + 16 = 0
0 + s2 = 0 + 16
s2 = 0 + 16

Combine like terms: 0 + 16 = 16
s2 = 16

Simplifying
s2 = 16

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