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Simplifying 2r2 + -72 = -10r Reorder the terms: -72 + 2r2 = -10r Solving -72 + 2r2 = -10r Solving for variable 'r'. Reorder the terms: -72 + 10r + 2r2 = -10r + 10r Combine like terms: -10r + 10r = 0 -72 + 10r + 2r2 = 0 Factor out the Greatest Common Factor (GCF), '2'. 2(-36 + 5r + r2) = 0 Factor a trinomial. 2((-9 + -1r)(4 + -1r)) = 0 Ignore the factor 2.Subproblem 1
Set the factor '(-9 + -1r)' equal to zero and attempt to solve: Simplifying -9 + -1r = 0 Solving -9 + -1r = 0 Move all terms containing r to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + -1r = 0 + 9 Combine like terms: -9 + 9 = 0 0 + -1r = 0 + 9 -1r = 0 + 9 Combine like terms: 0 + 9 = 9 -1r = 9 Divide each side by '-1'. r = -9 Simplifying r = -9Subproblem 2
Set the factor '(4 + -1r)' equal to zero and attempt to solve: Simplifying 4 + -1r = 0 Solving 4 + -1r = 0 Move all terms containing r to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + -1r = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -1r = 0 + -4 -1r = 0 + -4 Combine like terms: 0 + -4 = -4 -1r = -4 Divide each side by '-1'. r = 4 Simplifying r = 4Solution
r = {-9, 4}
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