81y*y-16=0

Solution for 81y*y-16=0 equation:

Simplifying
81y * y + -16 = 0

Multiply y * y
81y2 + -16 = 0

Reorder the terms:
-16 + 81y2 = 0

Solving
-16 + 81y2 = 0

Solving for variable 'y'.

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

Add '16' to each side of the equation.
-16 + 16 + 81y2 = 0 + 16

Combine like terms: -16 + 16 = 0
0 + 81y2 = 0 + 16
81y2 = 0 + 16

Combine like terms: 0 + 16 = 16
81y2 = 16

Divide each side by '81'.
y2 = 0.1975308642

Simplifying
y2 = 0.1975308642

Take the square root of each side:
y = {-0.444444444, 0.444444444}