X^2-129=15

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Solution for X^2-129=15 equation: 


Simplifying
X2 + -129 = 15

Reorder the terms:
-129 + X2 = 15

Solving
-129 + X2 = 15

Solving for variable 'X'.

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

Add '129' to each side of the equation.
-129 + 129 + X2 = 15 + 129

Combine like terms: -129 + 129 = 0
0 + X2 = 15 + 129
X2 = 15 + 129

Combine like terms: 15 + 129 = 144
X2 = 144

Simplifying
X2 = 144

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

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