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Simplifying x2 + -15x + -21 = -8x + -3 Reorder the terms: -21 + -15x + x2 = -8x + -3 Reorder the terms: -21 + -15x + x2 = -3 + -8x Solving -21 + -15x + x2 = -3 + -8x Solving for variable 'x'. Reorder the terms: -21 + 3 + -15x + 8x + x2 = -3 + -8x + 3 + 8x Combine like terms: -21 + 3 = -18 -18 + -15x + 8x + x2 = -3 + -8x + 3 + 8x Combine like terms: -15x + 8x = -7x -18 + -7x + x2 = -3 + -8x + 3 + 8x Reorder the terms: -18 + -7x + x2 = -3 + 3 + -8x + 8x Combine like terms: -3 + 3 = 0 -18 + -7x + x2 = 0 + -8x + 8x -18 + -7x + x2 = -8x + 8x Combine like terms: -8x + 8x = 0 -18 + -7x + x2 = 0 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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