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Simplifying
(x2 + 9) = 21
Reorder the terms:
(9 + x2) = 21
Remove parenthesis around (9 + x2)
9 + x2 = 21
Solving
9 + x2 = 21
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-9' to each side of the equation.
9 + -9 + x2 = 21 + -9
Combine like terms: 9 + -9 = 0
0 + x2 = 21 + -9
x2 = 21 + -9
Combine like terms: 21 + -9 = 12
x2 = 12
Simplifying
x2 = 12
Take the square root of each side:
x = {-3.464101615, 3.464101615}
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