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Simplifying 0 = 3x2 + 21x + -3x + -21 Reorder the terms: 0 = -21 + 21x + -3x + 3x2 Combine like terms: 21x + -3x = 18x 0 = -21 + 18x + 3x2 Solving 0 = -21 + 18x + 3x2 Solving for variable 'x'. Combine like terms: 0 + 21 = 21 21 + -18x + -3x2 = -21 + 18x + 3x2 + 21 + -18x + -3x2 Reorder the terms: 21 + -18x + -3x2 = -21 + 21 + 18x + -18x + 3x2 + -3x2 Combine like terms: -21 + 21 = 0 21 + -18x + -3x2 = 0 + 18x + -18x + 3x2 + -3x2 21 + -18x + -3x2 = 18x + -18x + 3x2 + -3x2 Combine like terms: 18x + -18x = 0 21 + -18x + -3x2 = 0 + 3x2 + -3x2 21 + -18x + -3x2 = 3x2 + -3x2 Combine like terms: 3x2 + -3x2 = 0 21 + -18x + -3x2 = 0 Factor out the Greatest Common Factor (GCF), '3'. 3(7 + -6x + -1x2) = 0 Factor a trinomial. 3((1 + -1x)(7 + x)) = 0 Ignore the factor 3.Subproblem 1
Set the factor '(1 + -1x)' equal to zero and attempt to solve: Simplifying 1 + -1x = 0 Solving 1 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + -1x = 0 + -1 Combine like terms: 1 + -1 = 0 0 + -1x = 0 + -1 -1x = 0 + -1 Combine like terms: 0 + -1 = -1 -1x = -1 Divide each side by '-1'. x = 1 Simplifying x = 1Subproblem 2
Set the factor '(7 + x)' equal to zero and attempt to solve: Simplifying 7 + x = 0 Solving 7 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + x = 0 + -7 Combine like terms: 7 + -7 = 0 0 + x = 0 + -7 x = 0 + -7 Combine like terms: 0 + -7 = -7 x = -7 Simplifying x = -7Solution
x = {1, -7}
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