2y^2-90=0

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

Simplifying
2y2 + -90 = 0

Reorder the terms:
-90 + 2y2 = 0

Solving
-90 + 2y2 = 0

Solving for variable 'y'.

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

Add '90' to each side of the equation.
-90 + 90 + 2y2 = 0 + 90

Combine like terms: -90 + 90 = 0
0 + 2y2 = 0 + 90
2y2 = 0 + 90

Combine like terms: 0 + 90 = 90
2y2 = 90

Divide each side by '2'.
y2 = 45

Simplifying
y2 = 45

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