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Simplifying 0 = 6x2 + 21x + 18 Reorder the terms: 0 = 18 + 21x + 6x2 Solving 0 = 18 + 21x + 6x2 Solving for variable 'x'. Combine like terms: 0 + -18 = -18 -18 + -21x + -6x2 = 18 + 21x + 6x2 + -18 + -21x + -6x2 Reorder the terms: -18 + -21x + -6x2 = 18 + -18 + 21x + -21x + 6x2 + -6x2 Combine like terms: 18 + -18 = 0 -18 + -21x + -6x2 = 0 + 21x + -21x + 6x2 + -6x2 -18 + -21x + -6x2 = 21x + -21x + 6x2 + -6x2 Combine like terms: 21x + -21x = 0 -18 + -21x + -6x2 = 0 + 6x2 + -6x2 -18 + -21x + -6x2 = 6x2 + -6x2 Combine like terms: 6x2 + -6x2 = 0 -18 + -21x + -6x2 = 0 Factor out the Greatest Common Factor (GCF), '-3'. -3(6 + 7x + 2x2) = 0 Factor a trinomial. -3((2 + x)(3 + 2x)) = 0 Ignore the factor -3.Subproblem 1
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 = -2Subproblem 2
Set the factor '(3 + 2x)' equal to zero and attempt to solve: Simplifying 3 + 2x = 0 Solving 3 + 2x = 0 Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 2x = 0 + -3 Combine like terms: 3 + -3 = 0 0 + 2x = 0 + -3 2x = 0 + -3 Combine like terms: 0 + -3 = -3 2x = -3 Divide each side by '2'. x = -1.5 Simplifying x = -1.5Solution
x = {-2, -1.5}
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