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Simplifying (7 + x)(11 + x) = 117 Multiply (7 + x) * (11 + x) (7(11 + x) + x(11 + x)) = 117 ((11 * 7 + x * 7) + x(11 + x)) = 117 ((77 + 7x) + x(11 + x)) = 117 (77 + 7x + (11 * x + x * x)) = 117 (77 + 7x + (11x + x2)) = 117 Combine like terms: 7x + 11x = 18x (77 + 18x + x2) = 117 Solving 77 + 18x + x2 = 117 Solving for variable 'x'. Reorder the terms: 77 + -117 + 18x + x2 = 117 + -117 Combine like terms: 77 + -117 = -40 -40 + 18x + x2 = 117 + -117 Combine like terms: 117 + -117 = 0 -40 + 18x + x2 = 0 Factor a trinomial. (-20 + -1x)(2 + -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 '(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 = 2Solution
x = {-20, 2}
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