81=n^2

Solution for 81=n^2 equation:

Simplifying
81 = n2

Solving
81 = n2

Solving for variable 'n'.

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

Add '-1n2' to each side of the equation.
81 + -1n2 = n2 + -1n2

Combine like terms: n2 + -1n2 = 0
81 + -1n2 = 0

Add '-81' to each side of the equation.
81 + -81 + -1n2 = 0 + -81

Combine like terms: 81 + -81 = 0
0 + -1n2 = 0 + -81
-1n2 = 0 + -81

Combine like terms: 0 + -81 = -81
-1n2 = -81

Divide each side by '-1'.
n2 = 81

Simplifying
n2 = 81

Take the square root of each side:
n = {-9, 9}