X^2-90=13

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Solution for X^2-90=13 equation: 


Simplifying
X2 + -90 = 13

Reorder the terms:
-90 + X2 = 13

Solving
-90 + X2 = 13

Solving for variable 'X'.

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

Add '90' to each side of the equation.
-90 + 90 + X2 = 13 + 90

Combine like terms: -90 + 90 = 0
0 + X2 = 13 + 90
X2 = 13 + 90

Combine like terms: 13 + 90 = 103
X2 = 103

Simplifying
X2 = 103

Take the square root of each side:
X = {-10.148891565, 10.148891565}

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