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Simplifying 4x(x + -4) = 12x + 72 Reorder the terms: 4x(-4 + x) = 12x + 72 (-4 * 4x + x * 4x) = 12x + 72 (-16x + 4x2) = 12x + 72 Reorder the terms: -16x + 4x2 = 72 + 12x Solving -16x + 4x2 = 72 + 12x Solving for variable 'x'. Reorder the terms: -72 + -16x + -12x + 4x2 = 72 + 12x + -72 + -12x Combine like terms: -16x + -12x = -28x -72 + -28x + 4x2 = 72 + 12x + -72 + -12x Reorder the terms: -72 + -28x + 4x2 = 72 + -72 + 12x + -12x Combine like terms: 72 + -72 = 0 -72 + -28x + 4x2 = 0 + 12x + -12x -72 + -28x + 4x2 = 12x + -12x Combine like terms: 12x + -12x = 0 -72 + -28x + 4x2 = 0 Factor out the Greatest Common Factor (GCF), '4'. 4(-18 + -7x + x2) = 0 Factor a trinomial. 4((-2 + -1x)(9 + -1x)) = 0 Ignore the factor 4.Subproblem 1
Set the factor '(-2 + -1x)' equal to zero and attempt to solve: Simplifying -2 + -1x = 0 Solving -2 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + -1x = 0 + 2 Combine like terms: -2 + 2 = 0 0 + -1x = 0 + 2 -1x = 0 + 2 Combine like terms: 0 + 2 = 2 -1x = 2 Divide each side by '-1'. x = -2 Simplifying x = -2Subproblem 2
Set the factor '(9 + -1x)' equal to zero and attempt to solve: Simplifying 9 + -1x = 0 Solving 9 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + -1x = 0 + -9 Combine like terms: 9 + -9 = 0 0 + -1x = 0 + -9 -1x = 0 + -9 Combine like terms: 0 + -9 = -9 -1x = -9 Divide each side by '-1'. x = 9 Simplifying x = 9Solution
x = {-2, 9}
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