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Simplifying (x + 9)(4x + -5) = (x + 4)(1 + -3x) Reorder the terms: (9 + x)(4x + -5) = (x + 4)(1 + -3x) Reorder the terms: (9 + x)(-5 + 4x) = (x + 4)(1 + -3x) Multiply (9 + x) * (-5 + 4x) (9(-5 + 4x) + x(-5 + 4x)) = (x + 4)(1 + -3x) ((-5 * 9 + 4x * 9) + x(-5 + 4x)) = (x + 4)(1 + -3x) ((-45 + 36x) + x(-5 + 4x)) = (x + 4)(1 + -3x) (-45 + 36x + (-5 * x + 4x * x)) = (x + 4)(1 + -3x) (-45 + 36x + (-5x + 4x2)) = (x + 4)(1 + -3x) Combine like terms: 36x + -5x = 31x (-45 + 31x + 4x2) = (x + 4)(1 + -3x) Reorder the terms: -45 + 31x + 4x2 = (4 + x)(1 + -3x) Multiply (4 + x) * (1 + -3x) -45 + 31x + 4x2 = (4(1 + -3x) + x(1 + -3x)) -45 + 31x + 4x2 = ((1 * 4 + -3x * 4) + x(1 + -3x)) -45 + 31x + 4x2 = ((4 + -12x) + x(1 + -3x)) -45 + 31x + 4x2 = (4 + -12x + (1 * x + -3x * x)) -45 + 31x + 4x2 = (4 + -12x + (1x + -3x2)) Combine like terms: -12x + 1x = -11x -45 + 31x + 4x2 = (4 + -11x + -3x2) Solving -45 + 31x + 4x2 = 4 + -11x + -3x2 Solving for variable 'x'. Reorder the terms: -45 + -4 + 31x + 11x + 4x2 + 3x2 = 4 + -11x + -3x2 + -4 + 11x + 3x2 Combine like terms: -45 + -4 = -49 -49 + 31x + 11x + 4x2 + 3x2 = 4 + -11x + -3x2 + -4 + 11x + 3x2 Combine like terms: 31x + 11x = 42x -49 + 42x + 4x2 + 3x2 = 4 + -11x + -3x2 + -4 + 11x + 3x2 Combine like terms: 4x2 + 3x2 = 7x2 -49 + 42x + 7x2 = 4 + -11x + -3x2 + -4 + 11x + 3x2 Reorder the terms: -49 + 42x + 7x2 = 4 + -4 + -11x + 11x + -3x2 + 3x2 Combine like terms: 4 + -4 = 0 -49 + 42x + 7x2 = 0 + -11x + 11x + -3x2 + 3x2 -49 + 42x + 7x2 = -11x + 11x + -3x2 + 3x2 Combine like terms: -11x + 11x = 0 -49 + 42x + 7x2 = 0 + -3x2 + 3x2 -49 + 42x + 7x2 = -3x2 + 3x2 Combine like terms: -3x2 + 3x2 = 0 -49 + 42x + 7x2 = 0 Factor out the Greatest Common Factor (GCF), '7'. 7(-7 + 6x + x2) = 0 Factor a trinomial. 7((-7 + -1x)(1 + -1x)) = 0 Ignore the factor 7.Subproblem 1
Set the factor '(-7 + -1x)' equal to zero and attempt to solve: Simplifying -7 + -1x = 0 Solving -7 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + -1x = 0 + 7 Combine like terms: -7 + 7 = 0 0 + -1x = 0 + 7 -1x = 0 + 7 Combine like terms: 0 + 7 = 7 -1x = 7 Divide each side by '-1'. x = -7 Simplifying x = -7Subproblem 2
Set the factor '(1 + -1x)' equal to zero and attempt to solve: Simplifying 1 + -1x = 0 Solving 1 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + -1x = 0 + -1 Combine like terms: 1 + -1 = 0 0 + -1x = 0 + -1 -1x = 0 + -1 Combine like terms: 0 + -1 = -1 -1x = -1 Divide each side by '-1'. x = 1 Simplifying x = 1Solution
x = {-7, 1}
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