n^2-81=

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Solution for n^2-81= equation: 


Simplifying
n2 + -81 = 0

Reorder the terms:
-81 + n2 = 0

Solving
-81 + n2 = 0

Solving for variable 'n'.

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

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

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

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

Simplifying
n2 = 81

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

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