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Simplifying (7x + -9)(2x + 4) = 0 Reorder the terms: (-9 + 7x)(2x + 4) = 0 Reorder the terms: (-9 + 7x)(4 + 2x) = 0 Multiply (-9 + 7x) * (4 + 2x) (-9(4 + 2x) + 7x * (4 + 2x)) = 0 ((4 * -9 + 2x * -9) + 7x * (4 + 2x)) = 0 ((-36 + -18x) + 7x * (4 + 2x)) = 0 (-36 + -18x + (4 * 7x + 2x * 7x)) = 0 (-36 + -18x + (28x + 14x2)) = 0 Combine like terms: -18x + 28x = 10x (-36 + 10x + 14x2) = 0 Solving -36 + 10x + 14x2 = 0 Solving for variable 'x'. Factor out the Greatest Common Factor (GCF), '2'. 2(-18 + 5x + 7x2) = 0 Factor a trinomial. 2((-2 + -1x)(9 + -7x)) = 0 Ignore the factor 2.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 '(9 + -7x)' equal to zero and attempt to solve: Simplifying 9 + -7x = 0 Solving 9 + -7x = 0 Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + -7x = 0 + -9 Combine like terms: 9 + -9 = 0 0 + -7x = 0 + -9 -7x = 0 + -9 Combine like terms: 0 + -9 = -9 -7x = -9 Divide each side by '-7'. x = 1.285714286 Simplifying x = 1.285714286Solution
x = {-2, 1.285714286}
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