X^2+12=21

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Solution for X^2+12=21 equation: 


Simplifying
X2 + 12 = 21

Reorder the terms:
12 + X2 = 21

Solving
12 + X2 = 21

Solving for variable 'X'.

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

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

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

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

Simplifying
X2 = 9

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

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