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Simplifying r2 + 6r = 91 Reorder the terms: 6r + r2 = 91 Solving 6r + r2 = 91 Solving for variable 'r'. Reorder the terms: -91 + 6r + r2 = 91 + -91 Combine like terms: 91 + -91 = 0 -91 + 6r + r2 = 0 Factor a trinomial. (-13 + -1r)(7 + -1r) = 0Subproblem 1
Set the factor '(-13 + -1r)' equal to zero and attempt to solve: Simplifying -13 + -1r = 0 Solving -13 + -1r = 0 Move all terms containing r to the left, all other terms to the right. Add '13' to each side of the equation. -13 + 13 + -1r = 0 + 13 Combine like terms: -13 + 13 = 0 0 + -1r = 0 + 13 -1r = 0 + 13 Combine like terms: 0 + 13 = 13 -1r = 13 Divide each side by '-1'. r = -13 Simplifying r = -13Subproblem 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 = {-13, 7}
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