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Simplifying x(x + 3) + -9(x + 3) = 0 Reorder the terms: x(3 + x) + -9(x + 3) = 0 (3 * x + x * x) + -9(x + 3) = 0 (3x + x2) + -9(x + 3) = 0 Reorder the terms: 3x + x2 + -9(3 + x) = 0 3x + x2 + (3 * -9 + x * -9) = 0 3x + x2 + (-27 + -9x) = 0 Reorder the terms: -27 + 3x + -9x + x2 = 0 Combine like terms: 3x + -9x = -6x -27 + -6x + x2 = 0 Solving -27 + -6x + x2 = 0 Solving for variable 'x'. Factor a trinomial. (-3 + -1x)(9 + -1x) = 0Subproblem 1
Set the factor '(-3 + -1x)' equal to zero and attempt to solve: Simplifying -3 + -1x = 0 Solving -3 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + -1x = 0 + 3 Combine like terms: -3 + 3 = 0 0 + -1x = 0 + 3 -1x = 0 + 3 Combine like terms: 0 + 3 = 3 -1x = 3 Divide each side by '-1'. x = -3 Simplifying x = -3Subproblem 2
Set the factor '(9 + -1x)' equal to zero and attempt to solve: Simplifying 9 + -1x = 0 Solving 9 + -1x = 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 + -1x = 0 + -9 Combine like terms: 9 + -9 = 0 0 + -1x = 0 + -9 -1x = 0 + -9 Combine like terms: 0 + -9 = -9 -1x = -9 Divide each side by '-1'. x = 9 Simplifying x = 9Solution
x = {-3, 9}
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