81-(y+1)2=0

Solution for 81-(y+1)2=0 equation:

Simplifying
81 + -1(y + 1) * 2 = 0

Reorder the terms:
81 + -1(1 + y) * 2 = 0

Reorder the terms for easier multiplication:
81 + -1 * 2(1 + y) = 0

Multiply -1 * 2
81 + -2(1 + y) = 0
81 + (1 * -2 + y * -2) = 0
81 + (-2 + -2y) = 0

Combine like terms: 81 + -2 = 79
79 + -2y = 0

Solving
79 + -2y = 0

Solving for variable 'y'.

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

Add '-79' to each side of the equation.
79 + -79 + -2y = 0 + -79

Combine like terms: 79 + -79 = 0
0 + -2y = 0 + -79
-2y = 0 + -79

Combine like terms: 0 + -79 = -79
-2y = -79

Divide each side by '-2'.
y = 39.5

Simplifying
y = 39.5