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Simplifying 28r2 + -40r = 0 Reorder the terms: -40r + 28r2 = 0 Solving -40r + 28r2 = 0 Solving for variable 'r'. Factor out the Greatest Common Factor (GCF), '4r'. 4r(-10 + 7r) = 0 Ignore the factor 4.Subproblem 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 '(-10 + 7r)' equal to zero and attempt to solve: Simplifying -10 + 7r = 0 Solving -10 + 7r = 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 + 7r = 0 + 10 Combine like terms: -10 + 10 = 0 0 + 7r = 0 + 10 7r = 0 + 10 Combine like terms: 0 + 10 = 10 7r = 10 Divide each side by '7'. r = 1.428571429 Simplifying r = 1.428571429Solution
r = {0, 1.428571429}
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