y^2-12=9

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Solution for y^2-12=9 equation: 


Simplifying
y2 + -12 = 9

Reorder the terms:
-12 + y2 = 9

Solving
-12 + y2 = 9

Solving for variable 'y'.

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

Add '12' to each side of the equation.
-12 + 12 + y2 = 9 + 12

Combine like terms: -12 + 12 = 0
0 + y2 = 9 + 12
y2 = 9 + 12

Combine like terms: 9 + 12 = 21
y2 = 21

Simplifying
y2 = 21

Take the square root of each side:
y = {-4.582575695, 4.582575695}

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