X^2+21=165

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Solution for X^2+21=165 equation: 


Simplifying
X2 + 21 = 165

Reorder the terms:
21 + X2 = 165

Solving
21 + X2 = 165

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 = 165 + -21

Combine like terms: 21 + -21 = 0
0 + X2 = 165 + -21
X2 = 165 + -21

Combine like terms: 165 + -21 = 144
X2 = 144

Simplifying
X2 = 144

Take the square root of each side:
X = {-12, 12}

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