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Simplifying x(x + 2) + -9(x + 2) = 0 Reorder the terms: x(2 + x) + -9(x + 2) = 0 (2 * x + x * x) + -9(x + 2) = 0 (2x + x2) + -9(x + 2) = 0 Reorder the terms: 2x + x2 + -9(2 + x) = 0 2x + x2 + (2 * -9 + x * -9) = 0 2x + x2 + (-18 + -9x) = 0 Reorder the terms: -18 + 2x + -9x + x2 = 0 Combine like terms: 2x + -9x = -7x -18 + -7x + x2 = 0 Solving -18 + -7x + x2 = 0 Solving for variable 'x'. Factor a trinomial. (-2 + -1x)(9 + -1x) = 0Subproblem 1
Set the factor '(-2 + -1x)' equal to zero and attempt to solve: Simplifying -2 + -1x = 0 Solving -2 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + -1x = 0 + 2 Combine like terms: -2 + 2 = 0 0 + -1x = 0 + 2 -1x = 0 + 2 Combine like terms: 0 + 2 = 2 -1x = 2 Divide each side by '-1'. x = -2 Simplifying x = -2Subproblem 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 = {-2, 9}
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