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Simplifying 13r2 + 21r + -10 = 0 Reorder the terms: -10 + 21r + 13r2 = 0 Solving -10 + 21r + 13r2 = 0 Solving for variable 'r'. Factor a trinomial. (-2 + -1r)(5 + -13r) = 0Subproblem 1
Set the factor '(-2 + -1r)' equal to zero and attempt to solve: Simplifying -2 + -1r = 0 Solving -2 + -1r = 0 Move all terms containing r to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + -1r = 0 + 2 Combine like terms: -2 + 2 = 0 0 + -1r = 0 + 2 -1r = 0 + 2 Combine like terms: 0 + 2 = 2 -1r = 2 Divide each side by '-1'. r = -2 Simplifying r = -2Subproblem 2
Set the factor '(5 + -13r)' equal to zero and attempt to solve: Simplifying 5 + -13r = 0 Solving 5 + -13r = 0 Move all terms containing r to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + -13r = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -13r = 0 + -5 -13r = 0 + -5 Combine like terms: 0 + -5 = -5 -13r = -5 Divide each side by '-13'. r = 0.3846153846 Simplifying r = 0.3846153846Solution
r = {-2, 0.3846153846}
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