x^2-81=16

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Solution for x^2-81=16 equation: 


Simplifying
x2 + -81 = 16

Reorder the terms:
-81 + x2 = 16

Solving
-81 + x2 = 16

Solving for variable 'x'.

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

Add '81' to each side of the equation.
-81 + 81 + x2 = 16 + 81

Combine like terms: -81 + 81 = 0
0 + x2 = 16 + 81
x2 = 16 + 81

Combine like terms: 16 + 81 = 97
x2 = 97

Simplifying
x2 = 97

Take the square root of each side:
x = {-9.848857802, 9.848857802}

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