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Simplifying (x + 5)(3x + -9) = 0 Reorder the terms: (5 + x)(3x + -9) = 0 Reorder the terms: (5 + x)(-9 + 3x) = 0 Multiply (5 + x) * (-9 + 3x) (5(-9 + 3x) + x(-9 + 3x)) = 0 ((-9 * 5 + 3x * 5) + x(-9 + 3x)) = 0 ((-45 + 15x) + x(-9 + 3x)) = 0 (-45 + 15x + (-9 * x + 3x * x)) = 0 (-45 + 15x + (-9x + 3x2)) = 0 Combine like terms: 15x + -9x = 6x (-45 + 6x + 3x2) = 0 Solving -45 + 6x + 3x2 = 0 Solving for variable 'x'. Factor out the Greatest Common Factor (GCF), '3'. 3(-15 + 2x + x2) = 0 Factor a trinomial. 3((-5 + -1x)(3 + -1x)) = 0 Ignore the factor 3.Subproblem 1
Set the factor '(-5 + -1x)' equal to zero and attempt to solve: Simplifying -5 + -1x = 0 Solving -5 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + -1x = 0 + 5 Combine like terms: -5 + 5 = 0 0 + -1x = 0 + 5 -1x = 0 + 5 Combine like terms: 0 + 5 = 5 -1x = 5 Divide each side by '-1'. x = -5 Simplifying x = -5Subproblem 2
Set the factor '(3 + -1x)' equal to zero and attempt to solve: Simplifying 3 + -1x = 0 Solving 3 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -1x = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -1x = 0 + -3 -1x = 0 + -3 Combine like terms: 0 + -3 = -3 -1x = -3 Divide each side by '-1'. x = 3 Simplifying x = 3Solution
x = {-5, 3}
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