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Simplifying x(9 + x) = 4(2x + 5) (9 * x + x * x) = 4(2x + 5) (9x + x2) = 4(2x + 5) Reorder the terms: 9x + x2 = 4(5 + 2x) 9x + x2 = (5 * 4 + 2x * 4) 9x + x2 = (20 + 8x) Solving 9x + x2 = 20 + 8x Solving for variable 'x'. Reorder the terms: -20 + 9x + -8x + x2 = 20 + 8x + -20 + -8x Combine like terms: 9x + -8x = 1x -20 + 1x + x2 = 20 + 8x + -20 + -8x Reorder the terms: -20 + 1x + x2 = 20 + -20 + 8x + -8x Combine like terms: 20 + -20 = 0 -20 + 1x + x2 = 0 + 8x + -8x -20 + 1x + x2 = 8x + -8x Combine like terms: 8x + -8x = 0 -20 + 1x + x2 = 0 Factor a trinomial. (-5 + -1x)(4 + -1x) = 0Subproblem 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 '(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 = {-5, 4}
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