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Simplifying 2r(4r + 5)(r + -1) = 0 Reorder the terms: 2r(5 + 4r)(r + -1) = 0 Reorder the terms: 2r(5 + 4r)(-1 + r) = 0 Multiply (5 + 4r) * (-1 + r) 2r(5(-1 + r) + 4r * (-1 + r)) = 0 2r((-1 * 5 + r * 5) + 4r * (-1 + r)) = 0 2r((-5 + 5r) + 4r * (-1 + r)) = 0 2r(-5 + 5r + (-1 * 4r + r * 4r)) = 0 2r(-5 + 5r + (-4r + 4r2)) = 0 Combine like terms: 5r + -4r = 1r 2r(-5 + 1r + 4r2) = 0 (-5 * 2r + 1r * 2r + 4r2 * 2r) = 0 (-10r + 2r2 + 8r3) = 0 Solving -10r + 2r2 + 8r3 = 0 Solving for variable 'r'. Factor out the Greatest Common Factor (GCF), '2r'. 2r(-5 + r + 4r2) = 0 Factor a trinomial. 2r((-5 + -4r)(1 + -1r)) = 0 Ignore the factor 2.Subproblem 1
Set the factor 'r' equal to zero and attempt to solve: Simplifying r = 0 Solving r = 0 Move all terms containing r to the left, all other terms to the right. Simplifying r = 0Subproblem 2
Set the factor '(-5 + -4r)' equal to zero and attempt to solve: Simplifying -5 + -4r = 0 Solving -5 + -4r = 0 Move all terms containing r to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + -4r = 0 + 5 Combine like terms: -5 + 5 = 0 0 + -4r = 0 + 5 -4r = 0 + 5 Combine like terms: 0 + 5 = 5 -4r = 5 Divide each side by '-4'. r = -1.25 Simplifying r = -1.25Subproblem 3
Set the factor '(1 + -1r)' equal to zero and attempt to solve: Simplifying 1 + -1r = 0 Solving 1 + -1r = 0 Move all terms containing r to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + -1r = 0 + -1 Combine like terms: 1 + -1 = 0 0 + -1r = 0 + -1 -1r = 0 + -1 Combine like terms: 0 + -1 = -1 -1r = -1 Divide each side by '-1'. r = 1 Simplifying r = 1Solution
r = {0, -1.25, 1}
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