x^2+21=102

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Solution for x^2+21=102 equation: 


Simplifying
x2 + 21 = 102

Reorder the terms:
21 + x2 = 102

Solving
21 + x2 = 102

Solving for variable 'x'.

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

Add '-21' to each side of the equation.
21 + -21 + x2 = 102 + -21

Combine like terms: 21 + -21 = 0
0 + x2 = 102 + -21
x2 = 102 + -21

Combine like terms: 102 + -21 = 81
x2 = 81

Simplifying
x2 = 81

Take the square root of each side:
x = {-9, 9}

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