X^2-42=90

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Solution for X^2-42=90 equation: 


Simplifying
X2 + -42 = 90

Reorder the terms:
-42 + X2 = 90

Solving
-42 + X2 = 90

Solving for variable 'X'.

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

Add '42' to each side of the equation.
-42 + 42 + X2 = 90 + 42

Combine like terms: -42 + 42 = 0
0 + X2 = 90 + 42
X2 = 90 + 42

Combine like terms: 90 + 42 = 132
X2 = 132

Simplifying
X2 = 132

Take the square root of each side:
X = {-11.489125293, 11.489125293}

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