x^2-81=80

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Solution for x^2-81=80 equation: 


Simplifying
x2 + -81 = 80

Reorder the terms:
-81 + x2 = 80

Solving
-81 + x2 = 80

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 = 80 + 81

Combine like terms: -81 + 81 = 0
0 + x2 = 80 + 81
x2 = 80 + 81

Combine like terms: 80 + 81 = 161
x2 = 161

Simplifying
x2 = 161

Take the square root of each side:
x = {-12.68857754, 12.68857754}

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