X^2-21=-12

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Solution for X^2-21=-12 equation: 


Simplifying
X2 + -21 = -12

Reorder the terms:
-21 + X2 = -12

Solving
-21 + X2 = -12

Solving for variable 'X'.

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

Add '21' to each side of the equation.
-21 + 21 + X2 = -12 + 21

Combine like terms: -21 + 21 = 0
0 + X2 = -12 + 21
X2 = -12 + 21

Combine like terms: -12 + 21 = 9
X2 = 9

Simplifying
X2 = 9

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

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