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Simplifying 12r2 + 57r + 63 = 0 Reorder the terms: 63 + 57r + 12r2 = 0 Solving 63 + 57r + 12r2 = 0 Solving for variable 'r'. Factor out the Greatest Common Factor (GCF), '3'. 3(21 + 19r + 4r2) = 0 Factor a trinomial. 3((3 + r)(7 + 4r)) = 0 Ignore the factor 3.Subproblem 1
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 = -3Subproblem 2
Set the factor '(7 + 4r)' equal to zero and attempt to solve: Simplifying 7 + 4r = 0 Solving 7 + 4r = 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 + 4r = 0 + -7 Combine like terms: 7 + -7 = 0 0 + 4r = 0 + -7 4r = 0 + -7 Combine like terms: 0 + -7 = -7 4r = -7 Divide each side by '4'. r = -1.75 Simplifying r = -1.75Solution
r = {-3, -1.75}
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