x^2-18-81=0

Solution for x^2-18-81=0 equation:

Simplifying
x2 + -18 + -81 = 0

Reorder the terms:
-18 + -81 + x2 = 0

Combine like terms: -18 + -81 = -99
-99 + x2 = 0

Solving
-99 + x2 = 0

Solving for variable 'x'.

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

Add '99' to each side of the equation.
-99 + 99 + x2 = 0 + 99

Combine like terms: -99 + 99 = 0
0 + x2 = 0 + 99
x2 = 0 + 99

Combine like terms: 0 + 99 = 99
x2 = 99

Simplifying
x2 = 99

Take the square root of each side:
x = {-9.949874371, 9.949874371}