20y^2-4=0

Solution for 20y^2-4=0 equation:

Simplifying
20y2 + -4 = 0

Reorder the terms:
-4 + 20y2 = 0

Solving
-4 + 20y2 = 0

Solving for variable 'y'.

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

Add '4' to each side of the equation.
-4 + 4 + 20y2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + 20y2 = 0 + 4
20y2 = 0 + 4

Combine like terms: 0 + 4 = 4
20y2 = 4

Divide each side by '20'.
y2 = 0.2

Simplifying
y2 = 0.2

Take the square root of each side:
y = {-0.447213596, 0.447213596}