X^2-15=1

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Solution for X^2-15=1 equation: 


Simplifying
X2 + -15 = 1

Reorder the terms:
-15 + X2 = 1

Solving
-15 + X2 = 1

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 = 1 + 15

Combine like terms: -15 + 15 = 0
0 + X2 = 1 + 15
X2 = 1 + 15

Combine like terms: 1 + 15 = 16
X2 = 16

Simplifying
X2 = 16

Take the square root of each side:
X = {-4, 4}

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