x^2-64-81=0

Solution for x^2-64-81=0 equation:

Simplifying
x2 + -64 + -81 = 0

Reorder the terms:
-64 + -81 + x2 = 0

Combine like terms: -64 + -81 = -145
-145 + x2 = 0

Solving
-145 + x2 = 0

Solving for variable 'x'.

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

Add '145' to each side of the equation.
-145 + 145 + x2 = 0 + 145

Combine like terms: -145 + 145 = 0
0 + x2 = 0 + 145
x2 = 0 + 145

Combine like terms: 0 + 145 = 145
x2 = 145

Simplifying
x2 = 145

Take the square root of each side:
x = {-12.041594579, 12.041594579}