9(9y^2-1)=0

Solution for 9(9y^2-1)=0 equation:

Simplifying
9(9y2 + -1) = 0

Reorder the terms:
9(-1 + 9y2) = 0
(-1 * 9 + 9y2 * 9) = 0
(-9 + 81y2) = 0

Solving
-9 + 81y2 = 0

Solving for variable 'y'.

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

Add '9' to each side of the equation.
-9 + 9 + 81y2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + 81y2 = 0 + 9
81y2 = 0 + 9

Combine like terms: 0 + 9 = 9
81y2 = 9

Divide each side by '81'.
y2 = 0.1111111111

Simplifying
y2 = 0.1111111111

Take the square root of each side:
y = {-0.333333333, 0.333333333}