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Simplifying x(x + 20) + -13(x + 20) = 0 Reorder the terms: x(20 + x) + -13(x + 20) = 0 (20 * x + x * x) + -13(x + 20) = 0 (20x + x2) + -13(x + 20) = 0 Reorder the terms: 20x + x2 + -13(20 + x) = 0 20x + x2 + (20 * -13 + x * -13) = 0 20x + x2 + (-260 + -13x) = 0 Reorder the terms: -260 + 20x + -13x + x2 = 0 Combine like terms: 20x + -13x = 7x -260 + 7x + x2 = 0 Solving -260 + 7x + x2 = 0 Solving for variable 'x'. Factor a trinomial. (-20 + -1x)(13 + -1x) = 0Subproblem 1
Set the factor '(-20 + -1x)' equal to zero and attempt to solve: Simplifying -20 + -1x = 0 Solving -20 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + -1x = 0 + 20 Combine like terms: -20 + 20 = 0 0 + -1x = 0 + 20 -1x = 0 + 20 Combine like terms: 0 + 20 = 20 -1x = 20 Divide each side by '-1'. x = -20 Simplifying x = -20Subproblem 2
Set the factor '(13 + -1x)' equal to zero and attempt to solve: Simplifying 13 + -1x = 0 Solving 13 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + -1x = 0 + -13 Combine like terms: 13 + -13 = 0 0 + -1x = 0 + -13 -1x = 0 + -13 Combine like terms: 0 + -13 = -13 -1x = -13 Divide each side by '-1'. x = 13 Simplifying x = 13Solution
x = {-20, 13}
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