X^2-15=66

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Solution for X^2-15=66 equation: 


Simplifying
X2 + -15 = 66

Reorder the terms:
-15 + X2 = 66

Solving
-15 + X2 = 66

Solving for variable 'X'.

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

Add '15' to each side of the equation.
-15 + 15 + X2 = 66 + 15

Combine like terms: -15 + 15 = 0
0 + X2 = 66 + 15
X2 = 66 + 15

Combine like terms: 66 + 15 = 81
X2 = 81

Simplifying
X2 = 81

Take the square root of each side:
X = {-9, 9}

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