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Simplifying
9 = 12 + -4x2
Solving
9 = 12 + -4x2
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '4x2' to each side of the equation.
9 + 4x2 = 12 + -4x2 + 4x2
Combine like terms: -4x2 + 4x2 = 0
9 + 4x2 = 12 + 0
9 + 4x2 = 12
Add '-9' to each side of the equation.
9 + -9 + 4x2 = 12 + -9
Combine like terms: 9 + -9 = 0
0 + 4x2 = 12 + -9
4x2 = 12 + -9
Combine like terms: 12 + -9 = 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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