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Simplifying x2 + 16x + 21 = 5x + 3 Reorder the terms: 21 + 16x + x2 = 5x + 3 Reorder the terms: 21 + 16x + x2 = 3 + 5x Solving 21 + 16x + x2 = 3 + 5x Solving for variable 'x'. Reorder the terms: 21 + -3 + 16x + -5x + x2 = 3 + 5x + -3 + -5x Combine like terms: 21 + -3 = 18 18 + 16x + -5x + x2 = 3 + 5x + -3 + -5x Combine like terms: 16x + -5x = 11x 18 + 11x + x2 = 3 + 5x + -3 + -5x Reorder the terms: 18 + 11x + x2 = 3 + -3 + 5x + -5x Combine like terms: 3 + -3 = 0 18 + 11x + x2 = 0 + 5x + -5x 18 + 11x + x2 = 5x + -5x Combine like terms: 5x + -5x = 0 18 + 11x + x2 = 0 Factor a trinomial. (9 + x)(2 + x) = 0Subproblem 1
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 = -9Subproblem 2
Set the factor '(2 + x)' equal to zero and attempt to solve: Simplifying 2 + x = 0 Solving 2 + x = 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 + x = 0 + -2 Combine like terms: 2 + -2 = 0 0 + x = 0 + -2 x = 0 + -2 Combine like terms: 0 + -2 = -2 x = -2 Simplifying x = -2Solution
x = {-9, -2}
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