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Simplifying 7x2 + 77x + -12 = 408 Reorder the terms: -12 + 77x + 7x2 = 408 Solving -12 + 77x + 7x2 = 408 Solving for variable 'x'. Reorder the terms: -12 + -408 + 77x + 7x2 = 408 + -408 Combine like terms: -12 + -408 = -420 -420 + 77x + 7x2 = 408 + -408 Combine like terms: 408 + -408 = 0 -420 + 77x + 7x2 = 0 Factor out the Greatest Common Factor (GCF), '7'. 7(-60 + 11x + x2) = 0 Factor a trinomial. 7((-15 + -1x)(4 + -1x)) = 0 Ignore the factor 7.Subproblem 1
Set the factor '(-15 + -1x)' equal to zero and attempt to solve: Simplifying -15 + -1x = 0 Solving -15 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + -1x = 0 + 15 Combine like terms: -15 + 15 = 0 0 + -1x = 0 + 15 -1x = 0 + 15 Combine like terms: 0 + 15 = 15 -1x = 15 Divide each side by '-1'. x = -15 Simplifying x = -15Subproblem 2
Set the factor '(4 + -1x)' equal to zero and attempt to solve: Simplifying 4 + -1x = 0 Solving 4 + -1x = 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 + -1x = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -1x = 0 + -4 -1x = 0 + -4 Combine like terms: 0 + -4 = -4 -1x = -4 Divide each side by '-1'. x = 4 Simplifying x = 4Solution
x = {-15, 4}
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