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Simplifying (x + -3)(x + 7) + 9 = 0 Reorder the terms: (-3 + x)(x + 7) + 9 = 0 Reorder the terms: (-3 + x)(7 + x) + 9 = 0 Multiply (-3 + x) * (7 + x) (-3(7 + x) + x(7 + x)) + 9 = 0 ((7 * -3 + x * -3) + x(7 + x)) + 9 = 0 ((-21 + -3x) + x(7 + x)) + 9 = 0 (-21 + -3x + (7 * x + x * x)) + 9 = 0 (-21 + -3x + (7x + x2)) + 9 = 0 Combine like terms: -3x + 7x = 4x (-21 + 4x + x2) + 9 = 0 Reorder the terms: -21 + 9 + 4x + x2 = 0 Combine like terms: -21 + 9 = -12 -12 + 4x + x2 = 0 Solving -12 + 4x + x2 = 0 Solving for variable 'x'. Factor a trinomial. (-6 + -1x)(2 + -1x) = 0Subproblem 1
Set the factor '(-6 + -1x)' equal to zero and attempt to solve: Simplifying -6 + -1x = 0 Solving -6 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + -1x = 0 + 6 Combine like terms: -6 + 6 = 0 0 + -1x = 0 + 6 -1x = 0 + 6 Combine like terms: 0 + 6 = 6 -1x = 6 Divide each side by '-1'. x = -6 Simplifying x = -6Subproblem 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 = {-6, 2}
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