x^2-21=15

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Solution for x^2-21=15 equation: 


Simplifying
x2 + -21 = 15

Reorder the terms:
-21 + x2 = 15

Solving
-21 + x2 = 15

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 = 15 + 21

Combine like terms: -21 + 21 = 0
0 + x2 = 15 + 21
x2 = 15 + 21

Combine like terms: 15 + 21 = 36
x2 = 36

Simplifying
x2 = 36

Take the square root of each side:
x = {-6, 6}

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