3y^2-18-90=0

Solution for 3y^2-18-90=0 equation:

Simplifying
3y2 + -18 + -90 = 0

Reorder the terms:
-18 + -90 + 3y2 = 0

Combine like terms: -18 + -90 = -108
-108 + 3y2 = 0

Solving
-108 + 3y2 = 0

Solving for variable 'y'.

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

Add '108' to each side of the equation.
-108 + 108 + 3y2 = 0 + 108

Combine like terms: -108 + 108 = 0
0 + 3y2 = 0 + 108
3y2 = 0 + 108

Combine like terms: 0 + 108 = 108
3y2 = 108

Divide each side by '3'.
y2 = 36

Simplifying
y2 = 36

Take the square root of each side:
y = {-6, 6}