2x^2-90=0

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

Simplifying
2x2 + -90 = 0

Reorder the terms:
-90 + 2x2 = 0

Solving
-90 + 2x2 = 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 + 2x2 = 0 + 90

Combine like terms: -90 + 90 = 0
0 + 2x2 = 0 + 90
2x2 = 0 + 90

Combine like terms: 0 + 90 = 90
2x2 = 90

Divide each side by '2'.
x2 = 45

Simplifying
x2 = 45

Take the square root of each side:
x = {-6.708203933, 6.708203933}