128=2y^2

Solution for 128=2y^2 equation:

Simplifying
128 = 2y2

Solving
128 = 2y2

Solving for variable 'y'.

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

Add '-2y2' to each side of the equation.
128 + -2y2 = 2y2 + -2y2

Combine like terms: 2y2 + -2y2 = 0
128 + -2y2 = 0

Add '-128' to each side of the equation.
128 + -128 + -2y2 = 0 + -128

Combine like terms: 128 + -128 = 0
0 + -2y2 = 0 + -128
-2y2 = 0 + -128

Combine like terms: 0 + -128 = -128
-2y2 = -128

Divide each side by '-2'.
y2 = 64

Simplifying
y2 = 64

Take the square root of each side:
y = {-8, 8}