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Simplifying (5x + 20)(3x + -15) = 0 Reorder the terms: (20 + 5x)(3x + -15) = 0 Reorder the terms: (20 + 5x)(-15 + 3x) = 0 Multiply (20 + 5x) * (-15 + 3x) (20(-15 + 3x) + 5x * (-15 + 3x)) = 0 ((-15 * 20 + 3x * 20) + 5x * (-15 + 3x)) = 0 ((-300 + 60x) + 5x * (-15 + 3x)) = 0 (-300 + 60x + (-15 * 5x + 3x * 5x)) = 0 (-300 + 60x + (-75x + 15x2)) = 0 Combine like terms: 60x + -75x = -15x (-300 + -15x + 15x2) = 0 Solving -300 + -15x + 15x2 = 0 Solving for variable 'x'. Factor out the Greatest Common Factor (GCF), '15'. 15(-20 + -1x + x2) = 0 Factor a trinomial. 15((-4 + -1x)(5 + -1x)) = 0 Ignore the factor 15.Subproblem 1
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 = -4Subproblem 2
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 = 5Solution
x = {-4, 5}
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