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Simplifying 20r2 + -17r + -63 = 0 Reorder the terms: -63 + -17r + 20r2 = 0 Solving -63 + -17r + 20r2 = 0 Solving for variable 'r'. Factor a trinomial. (-7 + -5r)(9 + -4r) = 0Subproblem 1
Set the factor '(-7 + -5r)' equal to zero and attempt to solve: Simplifying -7 + -5r = 0 Solving -7 + -5r = 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 + -5r = 0 + 7 Combine like terms: -7 + 7 = 0 0 + -5r = 0 + 7 -5r = 0 + 7 Combine like terms: 0 + 7 = 7 -5r = 7 Divide each side by '-5'. r = -1.4 Simplifying r = -1.4Subproblem 2
Set the factor '(9 + -4r)' equal to zero and attempt to solve: Simplifying 9 + -4r = 0 Solving 9 + -4r = 0 Move all terms containing r to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + -4r = 0 + -9 Combine like terms: 9 + -9 = 0 0 + -4r = 0 + -9 -4r = 0 + -9 Combine like terms: 0 + -9 = -9 -4r = -9 Divide each side by '-4'. r = 2.25 Simplifying r = 2.25Solution
r = {-1.4, 2.25}
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