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Simplifying
(y2 + -4) = 0
Reorder the terms:
(-4 + y2) = 0
Remove parenthesis around (-4 + y2)
-4 + y2 = 0
Solving
-4 + y2 = 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 + y2 = 0 + 4
Combine like terms: -4 + 4 = 0
0 + y2 = 0 + 4
y2 = 0 + 4
Combine like terms: 0 + 4 = 4
y2 = 4
Simplifying
y2 = 4
Take the square root of each side:
y = {-2, 2}
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