(s-4)2-81=0

Solution for (s-4)2-81=0 equation:

Simplifying
(s + -4) * 2 + -81 = 0

Reorder the terms:
(-4 + s) * 2 + -81 = 0

Reorder the terms for easier multiplication:
2(-4 + s) + -81 = 0
(-4 * 2 + s * 2) + -81 = 0
(-8 + 2s) + -81 = 0

Reorder the terms:
-8 + -81 + 2s = 0

Combine like terms: -8 + -81 = -89
-89 + 2s = 0

Solving
-89 + 2s = 0

Solving for variable 's'.

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

Add '89' to each side of the equation.
-89 + 89 + 2s = 0 + 89

Combine like terms: -89 + 89 = 0
0 + 2s = 0 + 89
2s = 0 + 89

Combine like terms: 0 + 89 = 89
2s = 89

Divide each side by '2'.
s = 44.5

Simplifying
s = 44.5