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Simplifying r2 = 11r + -28 Reorder the terms: r2 = -28 + 11r Solving r2 = -28 + 11r Solving for variable 'r'. Reorder the terms: 28 + -11r + r2 = -28 + 11r + 28 + -11r Reorder the terms: 28 + -11r + r2 = -28 + 28 + 11r + -11r Combine like terms: -28 + 28 = 0 28 + -11r + r2 = 0 + 11r + -11r 28 + -11r + r2 = 11r + -11r Combine like terms: 11r + -11r = 0 28 + -11r + r2 = 0 Factor a trinomial. (4 + -1r)(7 + -1r) = 0Subproblem 1
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 = 4Subproblem 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 = {4, 7}
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