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Simplifying 21r2 + 17r + -8 = 0 Reorder the terms: -8 + 17r + 21r2 = 0 Solving -8 + 17r + 21r2 = 0 Solving for variable 'r'. Factor a trinomial. (-8 + -7r)(1 + -3r) = 0Subproblem 1
Set the factor '(-8 + -7r)' equal to zero and attempt to solve: Simplifying -8 + -7r = 0 Solving -8 + -7r = 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 + -7r = 0 + 8 Combine like terms: -8 + 8 = 0 0 + -7r = 0 + 8 -7r = 0 + 8 Combine like terms: 0 + 8 = 8 -7r = 8 Divide each side by '-7'. r = -1.142857143 Simplifying r = -1.142857143Subproblem 2
Set the factor '(1 + -3r)' equal to zero and attempt to solve: Simplifying 1 + -3r = 0 Solving 1 + -3r = 0 Move all terms containing r to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + -3r = 0 + -1 Combine like terms: 1 + -1 = 0 0 + -3r = 0 + -1 -3r = 0 + -1 Combine like terms: 0 + -1 = -1 -3r = -1 Divide each side by '-3'. r = 0.3333333333 Simplifying r = 0.3333333333Solution
r = {-1.142857143, 0.3333333333}
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