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Simplifying
9 = 3x2 + -18
Reorder the terms:
9 = -18 + 3x2
Solving
9 = -18 + 3x2
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-3x2' to each side of the equation.
9 + -3x2 = -18 + 3x2 + -3x2
Combine like terms: 3x2 + -3x2 = 0
9 + -3x2 = -18 + 0
9 + -3x2 = -18
Add '-9' to each side of the equation.
9 + -9 + -3x2 = -18 + -9
Combine like terms: 9 + -9 = 0
0 + -3x2 = -18 + -9
-3x2 = -18 + -9
Combine like terms: -18 + -9 = -27
-3x2 = -27
Divide each side by '-3'.
x2 = 9
Simplifying
x2 = 9
Take the square root of each side:
x = {-3, 3}
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