(x^2-90)=0

Solution for (x^2-90)=0 equation:

Simplifying
(x2 + -90) = 0

Reorder the terms:
(-90 + x2) = 0

Remove parenthesis around (-90 + x2)
-90 + x2 = 0

Solving
-90 + x2 = 0

Solving for variable 'x'.

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

Add '90' to each side of the equation.
-90 + 90 + x2 = 0 + 90

Combine like terms: -90 + 90 = 0
0 + x2 = 0 + 90
x2 = 0 + 90

Combine like terms: 0 + 90 = 90
x2 = 90

Simplifying
x2 = 90

Take the square root of each side:
x = {-9.486832981, 9.486832981}