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Simplifying 9x2 + 42x = 15 Reorder the terms: 42x + 9x2 = 15 Solving 42x + 9x2 = 15 Solving for variable 'x'. Reorder the terms: -15 + 42x + 9x2 = 15 + -15 Combine like terms: 15 + -15 = 0 -15 + 42x + 9x2 = 0 Factor out the Greatest Common Factor (GCF), '3'. 3(-5 + 14x + 3x2) = 0 Factor a trinomial. 3((-5 + -1x)(1 + -3x)) = 0 Ignore the factor 3.Subproblem 1
Set the factor '(-5 + -1x)' equal to zero and attempt to solve: Simplifying -5 + -1x = 0 Solving -5 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + -1x = 0 + 5 Combine like terms: -5 + 5 = 0 0 + -1x = 0 + 5 -1x = 0 + 5 Combine like terms: 0 + 5 = 5 -1x = 5 Divide each side by '-1'. x = -5 Simplifying x = -5Subproblem 2
Set the factor '(1 + -3x)' equal to zero and attempt to solve: Simplifying 1 + -3x = 0 Solving 1 + -3x = 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 + -3x = 0 + -1 Combine like terms: 1 + -1 = 0 0 + -3x = 0 + -1 -3x = 0 + -1 Combine like terms: 0 + -1 = -1 -3x = -1 Divide each side by '-3'. x = 0.3333333333 Simplifying x = 0.3333333333Solution
x = {-5, 0.3333333333}
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