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Simplifying r2 + -12r + 28 = -7 Reorder the terms: 28 + -12r + r2 = -7 Solving 28 + -12r + r2 = -7 Solving for variable 'r'. Reorder the terms: 28 + 7 + -12r + r2 = -7 + 7 Combine like terms: 28 + 7 = 35 35 + -12r + r2 = -7 + 7 Combine like terms: -7 + 7 = 0 35 + -12r + r2 = 0 Factor a trinomial. (5 + -1r)(7 + -1r) = 0Subproblem 1
Set the factor '(5 + -1r)' equal to zero and attempt to solve: Simplifying 5 + -1r = 0 Solving 5 + -1r = 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 + -1r = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -1r = 0 + -5 -1r = 0 + -5 Combine like terms: 0 + -5 = -5 -1r = -5 Divide each side by '-1'. r = 5 Simplifying r = 5Subproblem 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 = {5, 7}
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