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Simplifying 168 = 3x2 + 3x Reorder the terms: 168 = 3x + 3x2 Solving 168 = 3x + 3x2 Solving for variable 'x'. Reorder the terms: 168 + -3x + -3x2 = 3x + -3x + 3x2 + -3x2 Combine like terms: 3x + -3x = 0 168 + -3x + -3x2 = 0 + 3x2 + -3x2 168 + -3x + -3x2 = 3x2 + -3x2 Combine like terms: 3x2 + -3x2 = 0 168 + -3x + -3x2 = 0 Factor out the Greatest Common Factor (GCF), '3'. 3(56 + -1x + -1x2) = 0 Factor a trinomial. 3((7 + -1x)(8 + x)) = 0 Ignore the factor 3.Subproblem 1
Set the factor '(7 + -1x)' equal to zero and attempt to solve: Simplifying 7 + -1x = 0 Solving 7 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -1x = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -1x = 0 + -7 -1x = 0 + -7 Combine like terms: 0 + -7 = -7 -1x = -7 Divide each side by '-1'. x = 7 Simplifying x = 7Subproblem 2
Set the factor '(8 + x)' equal to zero and attempt to solve: Simplifying 8 + x = 0 Solving 8 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + x = 0 + -8 Combine like terms: 8 + -8 = 0 0 + x = 0 + -8 x = 0 + -8 Combine like terms: 0 + -8 = -8 x = -8 Simplifying x = -8Solution
x = {7, -8}
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