-y^2+9=0

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Solution for -y^2+9=0 equation: 


Simplifying
-1y2 + 9 = 0

Reorder the terms:
9 + -1y2 = 0

Solving
9 + -1y2 = 0

Solving for variable 'y'.

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

Add '-9' to each side of the equation.
9 + -9 + -1y2 = 0 + -9

Combine like terms: 9 + -9 = 0
0 + -1y2 = 0 + -9
-1y2 = 0 + -9

Combine like terms: 0 + -9 = -9
-1y2 = -9

Divide each side by '-1'.
y2 = 9

Simplifying
y2 = 9

Take the square root of each side:
y = {-3, 3}

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