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Simplifying r2 + 13r = -30 Reorder the terms: 13r + r2 = -30 Solving 13r + r2 = -30 Solving for variable 'r'. Reorder the terms: 30 + 13r + r2 = -30 + 30 Combine like terms: -30 + 30 = 0 30 + 13r + r2 = 0 Factor a trinomial. (10 + r)(3 + r) = 0Subproblem 1
Set the factor '(10 + r)' equal to zero and attempt to solve: Simplifying 10 + r = 0 Solving 10 + r = 0 Move all terms containing r to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + r = 0 + -10 Combine like terms: 10 + -10 = 0 0 + r = 0 + -10 r = 0 + -10 Combine like terms: 0 + -10 = -10 r = -10 Simplifying r = -10Subproblem 2
Set the factor '(3 + r)' equal to zero and attempt to solve: Simplifying 3 + r = 0 Solving 3 + r = 0 Move all terms containing r to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + r = 0 + -3 Combine like terms: 3 + -3 = 0 0 + r = 0 + -3 r = 0 + -3 Combine like terms: 0 + -3 = -3 r = -3 Simplifying r = -3Solution
r = {-10, -3}
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