x^2-21=-21

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Solution for x^2-21=-21 equation: 


Simplifying
x2 + -21 = -21

Reorder the terms:
-21 + x2 = -21

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

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

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

Solving
x2 = 0

Solving for variable 'x'.

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

Simplifying
x2 = 0

Take the square root of each side:
x = {0}

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