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Simplifying 3x2 + 36x2 + 42x + -3x + -78 = 0 Reorder the terms: -78 + 42x + -3x + 3x2 + 36x2 = 0 Combine like terms: 42x + -3x = 39x -78 + 39x + 3x2 + 36x2 = 0 Combine like terms: 3x2 + 36x2 = 39x2 -78 + 39x + 39x2 = 0 Solving -78 + 39x + 39x2 = 0 Solving for variable 'x'. Factor out the Greatest Common Factor (GCF), '39'. 39(-2 + x + x2) = 0 Factor a trinomial. 39((-2 + -1x)(1 + -1x)) = 0 Ignore the factor 39.Subproblem 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 '(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 = 1Solution
x = {-2, 1}
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