x^2-1=81

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Solution for x^2-1=81 equation: 


Simplifying
x2 + -1 = 81

Reorder the terms:
-1 + x2 = 81

Solving
-1 + x2 = 81

Solving for variable 'x'.

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

Add '1' to each side of the equation.
-1 + 1 + x2 = 81 + 1

Combine like terms: -1 + 1 = 0
0 + x2 = 81 + 1
x2 = 81 + 1

Combine like terms: 81 + 1 = 82
x2 = 82

Simplifying
x2 = 82

Take the square root of each side:
x = {-9.055385138, 9.055385138}

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