x^2-144-81=0

Solution for x^2-144-81=0 equation:

Simplifying
x2 + -144 + -81 = 0

Reorder the terms:
-144 + -81 + x2 = 0

Combine like terms: -144 + -81 = -225
-225 + x2 = 0

Solving
-225 + x2 = 0

Solving for variable 'x'.

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

Add '225' to each side of the equation.
-225 + 225 + x2 = 0 + 225

Combine like terms: -225 + 225 = 0
0 + x2 = 0 + 225
x2 = 0 + 225

Combine like terms: 0 + 225 = 225
x2 = 225

Simplifying
x2 = 225

Take the square root of each side:
x = {-15, 15}