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Simplifying
-3x2 + 12 = -9
Reorder the terms:
12 + -3x2 = -9
Solving
12 + -3x2 = -9
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-12' to each side of the equation.
12 + -12 + -3x2 = -9 + -12
Combine like terms: 12 + -12 = 0
0 + -3x2 = -9 + -12
-3x2 = -9 + -12
Combine like terms: -9 + -12 = -21
-3x2 = -21
Divide each side by '-3'.
x2 = 7
Simplifying
x2 = 7
Take the square root of each side:
x = {-2.645751311, 2.645751311}
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