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Simplifying 0 = 3x2 + 9x + -12 Reorder the terms: 0 = -12 + 9x + 3x2 Solving 0 = -12 + 9x + 3x2 Solving for variable 'x'. Combine like terms: 0 + 12 = 12 12 + -9x + -3x2 = -12 + 9x + 3x2 + 12 + -9x + -3x2 Reorder the terms: 12 + -9x + -3x2 = -12 + 12 + 9x + -9x + 3x2 + -3x2 Combine like terms: -12 + 12 = 0 12 + -9x + -3x2 = 0 + 9x + -9x + 3x2 + -3x2 12 + -9x + -3x2 = 9x + -9x + 3x2 + -3x2 Combine like terms: 9x + -9x = 0 12 + -9x + -3x2 = 0 + 3x2 + -3x2 12 + -9x + -3x2 = 3x2 + -3x2 Combine like terms: 3x2 + -3x2 = 0 12 + -9x + -3x2 = 0 Factor out the Greatest Common Factor (GCF), '3'. 3(4 + -3x + -1x2) = 0 Factor a trinomial. 3((1 + -1x)(4 + x)) = 0 Ignore the factor 3.Subproblem 1
Set the factor '(1 + -1x)' equal to zero and attempt to solve: Simplifying 1 + -1x = 0 Solving 1 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + -1x = 0 + -1 Combine like terms: 1 + -1 = 0 0 + -1x = 0 + -1 -1x = 0 + -1 Combine like terms: 0 + -1 = -1 -1x = -1 Divide each side by '-1'. x = 1 Simplifying x = 1Subproblem 2
Set the factor '(4 + x)' equal to zero and attempt to solve: Simplifying 4 + x = 0 Solving 4 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = 0 + -4 Combine like terms: 4 + -4 = 0 0 + x = 0 + -4 x = 0 + -4 Combine like terms: 0 + -4 = -4 x = -4 Simplifying x = -4Solution
x = {1, -4}
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