X^2-8=81

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Solution for X^2-8=81 equation: 


Simplifying
X2 + -8 = 81

Reorder the terms:
-8 + X2 = 81

Solving
-8 + X2 = 81

Solving for variable 'X'.

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

Add '8' to each side of the equation.
-8 + 8 + X2 = 81 + 8

Combine like terms: -8 + 8 = 0
0 + X2 = 81 + 8
X2 = 81 + 8

Combine like terms: 81 + 8 = 89
X2 = 89

Simplifying
X2 = 89

Take the square root of each side:
X = {-9.433981132, 9.433981132}

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