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Simplifying 0 = (x + -9)(x + -4) Reorder the terms: 0 = (-9 + x)(x + -4) Reorder the terms: 0 = (-9 + x)(-4 + x) Multiply (-9 + x) * (-4 + x) 0 = (-9(-4 + x) + x(-4 + x)) 0 = ((-4 * -9 + x * -9) + x(-4 + x)) 0 = ((36 + -9x) + x(-4 + x)) 0 = (36 + -9x + (-4 * x + x * x)) 0 = (36 + -9x + (-4x + x2)) Combine like terms: -9x + -4x = -13x 0 = (36 + -13x + x2) Solving 0 = 36 + -13x + x2 Solving for variable 'x'. Combine like terms: 0 + -36 = -36 -36 + 13x + -1x2 = 36 + -13x + x2 + -36 + 13x + -1x2 Reorder the terms: -36 + 13x + -1x2 = 36 + -36 + -13x + 13x + x2 + -1x2 Combine like terms: 36 + -36 = 0 -36 + 13x + -1x2 = 0 + -13x + 13x + x2 + -1x2 -36 + 13x + -1x2 = -13x + 13x + x2 + -1x2 Combine like terms: -13x + 13x = 0 -36 + 13x + -1x2 = 0 + x2 + -1x2 -36 + 13x + -1x2 = x2 + -1x2 Combine like terms: x2 + -1x2 = 0 -36 + 13x + -1x2 = 0 Factor a trinomial. (-9 + x)(4 + -1x) = 0Subproblem 1
Set the factor '(-9 + x)' equal to zero and attempt to solve: Simplifying -9 + x = 0 Solving -9 + x = 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 + x = 0 + 9 Combine like terms: -9 + 9 = 0 0 + x = 0 + 9 x = 0 + 9 Combine like terms: 0 + 9 = 9 x = 9 Simplifying x = 9Subproblem 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 = {9, 4}
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