X^2-9=90

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Solution for X^2-9=90 equation: 


Simplifying
X2 + -9 = 90

Reorder the terms:
-9 + X2 = 90

Solving
-9 + X2 = 90

Solving for variable 'X'.

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

Add '9' to each side of the equation.
-9 + 9 + X2 = 90 + 9

Combine like terms: -9 + 9 = 0
0 + X2 = 90 + 9
X2 = 90 + 9

Combine like terms: 90 + 9 = 99
X2 = 99

Simplifying
X2 = 99

Take the square root of each side:
X = {-9.949874371, 9.949874371}

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