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Simplifying
-5y2 + 20 = 0
Reorder the terms:
20 + -5y2 = 0
Solving
20 + -5y2 = 0
Solving for variable 'y'.
Move all terms containing y to the left, all other terms to the right.
Add '-20' to each side of the equation.
20 + -20 + -5y2 = 0 + -20
Combine like terms: 20 + -20 = 0
0 + -5y2 = 0 + -20
-5y2 = 0 + -20
Combine like terms: 0 + -20 = -20
-5y2 = -20
Divide each side by '-5'.
y2 = 4
Simplifying
y2 = 4
Take the square root of each side:
y = {-2, 2}
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