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Simplifying 5r2 = 31r + 28 Reorder the terms: 5r2 = 28 + 31r Solving 5r2 = 28 + 31r Solving for variable 'r'. Reorder the terms: -28 + -31r + 5r2 = 28 + 31r + -28 + -31r Reorder the terms: -28 + -31r + 5r2 = 28 + -28 + 31r + -31r Combine like terms: 28 + -28 = 0 -28 + -31r + 5r2 = 0 + 31r + -31r -28 + -31r + 5r2 = 31r + -31r Combine like terms: 31r + -31r = 0 -28 + -31r + 5r2 = 0 Factor a trinomial. (-4 + -5r)(7 + -1r) = 0Subproblem 1
Set the factor '(-4 + -5r)' equal to zero and attempt to solve: Simplifying -4 + -5r = 0 Solving -4 + -5r = 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 + -5r = 0 + 4 Combine like terms: -4 + 4 = 0 0 + -5r = 0 + 4 -5r = 0 + 4 Combine like terms: 0 + 4 = 4 -5r = 4 Divide each side by '-5'. r = -0.8 Simplifying r = -0.8Subproblem 2
Set the factor '(7 + -1r)' equal to zero and attempt to solve: Simplifying 7 + -1r = 0 Solving 7 + -1r = 0 Move all terms containing r to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -1r = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -1r = 0 + -7 -1r = 0 + -7 Combine like terms: 0 + -7 = -7 -1r = -7 Divide each side by '-1'. r = 7 Simplifying r = 7Solution
r = {-0.8, 7}
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