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Simplifying r2 + 20r = 0 Reorder the terms: 20r + r2 = 0 Solving 20r + r2 = 0 Solving for variable 'r'. Factor out the Greatest Common Factor (GCF), 'r'. r(20 + r) = 0Subproblem 1
Set the factor 'r' equal to zero and attempt to solve: Simplifying r = 0 Solving r = 0 Move all terms containing r to the left, all other terms to the right. Simplifying r = 0Subproblem 2
Set the factor '(20 + r)' equal to zero and attempt to solve: Simplifying 20 + r = 0 Solving 20 + r = 0 Move all terms containing r to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + r = 0 + -20 Combine like terms: 20 + -20 = 0 0 + r = 0 + -20 r = 0 + -20 Combine like terms: 0 + -20 = -20 r = -20 Simplifying r = -20Solution
r = {0, -20}
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