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Simplifying -4x(x + -7) = 40 Reorder the terms: -4x(-7 + x) = 40 (-7 * -4x + x * -4x) = 40 (28x + -4x2) = 40 Solving 28x + -4x2 = 40 Solving for variable 'x'. Reorder the terms: -40 + 28x + -4x2 = 40 + -40 Combine like terms: 40 + -40 = 0 -40 + 28x + -4x2 = 0 Factor out the Greatest Common Factor (GCF), '4'. 4(-10 + 7x + -1x2) = 0 Factor a trinomial. 4((-5 + x)(2 + -1x)) = 0 Ignore the factor 4.Subproblem 1
Set the factor '(-5 + x)' equal to zero and attempt to solve: Simplifying -5 + x = 0 Solving -5 + x = 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 + x = 0 + 5 Combine like terms: -5 + 5 = 0 0 + x = 0 + 5 x = 0 + 5 Combine like terms: 0 + 5 = 5 x = 5 Simplifying x = 5Subproblem 2
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 = 2Solution
x = {5, 2}
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