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Simplifying 0 = x2 + 7x + -18 Reorder the terms: 0 = -18 + 7x + x2 Solving 0 = -18 + 7x + x2 Solving for variable 'x'. Combine like terms: 0 + 18 = 18 18 + -7x + -1x2 = -18 + 7x + x2 + 18 + -7x + -1x2 Reorder the terms: 18 + -7x + -1x2 = -18 + 18 + 7x + -7x + x2 + -1x2 Combine like terms: -18 + 18 = 0 18 + -7x + -1x2 = 0 + 7x + -7x + x2 + -1x2 18 + -7x + -1x2 = 7x + -7x + x2 + -1x2 Combine like terms: 7x + -7x = 0 18 + -7x + -1x2 = 0 + x2 + -1x2 18 + -7x + -1x2 = x2 + -1x2 Combine like terms: x2 + -1x2 = 0 18 + -7x + -1x2 = 0 Factor a trinomial. (2 + -1x)(9 + x) = 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 + x)' equal to zero and attempt to solve: Simplifying 9 + x = 0 Solving 9 + x = 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 + x = 0 + -9 Combine like terms: 9 + -9 = 0 0 + x = 0 + -9 x = 0 + -9 Combine like terms: 0 + -9 = -9 x = -9 Simplifying x = -9Solution
x = {2, -9}
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