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Simplifying 7r2 + 5r = 18 Reorder the terms: 5r + 7r2 = 18 Solving 5r + 7r2 = 18 Solving for variable 'r'. Reorder the terms: -18 + 5r + 7r2 = 18 + -18 Combine like terms: 18 + -18 = 0 -18 + 5r + 7r2 = 0 Factor a trinomial. (-2 + -1r)(9 + -7r) = 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 '(9 + -7r)' equal to zero and attempt to solve: Simplifying 9 + -7r = 0 Solving 9 + -7r = 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 + -7r = 0 + -9 Combine like terms: 9 + -9 = 0 0 + -7r = 0 + -9 -7r = 0 + -9 Combine like terms: 0 + -9 = -9 -7r = -9 Divide each side by '-7'. r = 1.285714286 Simplifying r = 1.285714286Solution
r = {-2, 1.285714286}
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