y^2+4-20=0

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

Simplifying
y2 + 4 + -20 = 0

Reorder the terms:
4 + -20 + y2 = 0

Combine like terms: 4 + -20 = -16
-16 + y2 = 0

Solving
-16 + y2 = 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 + y2 = 0 + 16

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

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

Simplifying
y2 = 16

Take the square root of each side:
y = {-4, 4}