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Simplifying r2 = -15r + -56 Reorder the terms: r2 = -56 + -15r Solving r2 = -56 + -15r Solving for variable 'r'. Reorder the terms: 56 + 15r + r2 = -56 + -15r + 56 + 15r Reorder the terms: 56 + 15r + r2 = -56 + 56 + -15r + 15r Combine like terms: -56 + 56 = 0 56 + 15r + r2 = 0 + -15r + 15r 56 + 15r + r2 = -15r + 15r Combine like terms: -15r + 15r = 0 56 + 15r + r2 = 0 Factor a trinomial. (8 + r)(7 + r) = 0Subproblem 1
Set the factor '(8 + r)' equal to zero and attempt to solve: Simplifying 8 + r = 0 Solving 8 + r = 0 Move all terms containing r to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + r = 0 + -8 Combine like terms: 8 + -8 = 0 0 + r = 0 + -8 r = 0 + -8 Combine like terms: 0 + -8 = -8 r = -8 Simplifying r = -8Subproblem 2
Set the factor '(7 + r)' equal to zero and attempt to solve: Simplifying 7 + r = 0 Solving 7 + r = 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 + r = 0 + -7 Combine like terms: 7 + -7 = 0 0 + r = 0 + -7 r = 0 + -7 Combine like terms: 0 + -7 = -7 r = -7 Simplifying r = -7Solution
r = {-8, -7}
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