X^2-18=90

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Solution for X^2-18=90 equation: 


Simplifying
X2 + -18 = 90

Reorder the terms:
-18 + X2 = 90

Solving
-18 + X2 = 90

Solving for variable 'X'.

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

Add '18' to each side of the equation.
-18 + 18 + X2 = 90 + 18

Combine like terms: -18 + 18 = 0
0 + X2 = 90 + 18
X2 = 90 + 18

Combine like terms: 90 + 18 = 108
X2 = 108

Simplifying
X2 = 108

Take the square root of each side:
X = {-10.392304845, 10.392304845}

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