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Simplifying (x + 4)(5x + -9) = 0 Reorder the terms: (4 + x)(5x + -9) = 0 Reorder the terms: (4 + x)(-9 + 5x) = 0 Multiply (4 + x) * (-9 + 5x) (4(-9 + 5x) + x(-9 + 5x)) = 0 ((-9 * 4 + 5x * 4) + x(-9 + 5x)) = 0 ((-36 + 20x) + x(-9 + 5x)) = 0 (-36 + 20x + (-9 * x + 5x * x)) = 0 (-36 + 20x + (-9x + 5x2)) = 0 Combine like terms: 20x + -9x = 11x (-36 + 11x + 5x2) = 0 Solving -36 + 11x + 5x2 = 0 Solving for variable 'x'. Factor a trinomial. (-4 + -1x)(9 + -5x) = 0Subproblem 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 '(9 + -5x)' equal to zero and attempt to solve: Simplifying 9 + -5x = 0 Solving 9 + -5x = 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 + -5x = 0 + -9 Combine like terms: 9 + -9 = 0 0 + -5x = 0 + -9 -5x = 0 + -9 Combine like terms: 0 + -9 = -9 -5x = -9 Divide each side by '-5'. x = 1.8 Simplifying x = 1.8Solution
x = {-4, 1.8}
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