X^2-100=21

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Solution for X^2-100=21 equation: 


Simplifying
X2 + -100 = 21

Reorder the terms:
-100 + X2 = 21

Solving
-100 + X2 = 21

Solving for variable 'X'.

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

Add '100' to each side of the equation.
-100 + 100 + X2 = 21 + 100

Combine like terms: -100 + 100 = 0
0 + X2 = 21 + 100
X2 = 21 + 100

Combine like terms: 21 + 100 = 121
X2 = 121

Simplifying
X2 = 121

Take the square root of each side:
X = {-11, 11}

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