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Simplifying
12 + -4x2 = 9
Solving
12 + -4x2 = 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 + -4x2 = 9 + -12
Combine like terms: 12 + -12 = 0
0 + -4x2 = 9 + -12
-4x2 = 9 + -12
Combine like terms: 9 + -12 = -3
-4x2 = -3
Divide each side by '-4'.
x2 = 0.75
Simplifying
x2 = 0.75
Take the square root of each side:
x = {-0.866025404, 0.866025404}
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