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Simplifying 25r2 + 80r + 64 = 0 Reorder the terms: 64 + 80r + 25r2 = 0 Solving 64 + 80r + 25r2 = 0 Solving for variable 'r'. Factor a trinomial. (8 + 5r)(8 + 5r) = 0Subproblem 1
Set the factor '(8 + 5r)' equal to zero and attempt to solve: Simplifying 8 + 5r = 0 Solving 8 + 5r = 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 + 5r = 0 + -8 Combine like terms: 8 + -8 = 0 0 + 5r = 0 + -8 5r = 0 + -8 Combine like terms: 0 + -8 = -8 5r = -8 Divide each side by '5'. r = -1.6 Simplifying r = -1.6Subproblem 2
Set the factor '(8 + 5r)' equal to zero and attempt to solve: Simplifying 8 + 5r = 0 Solving 8 + 5r = 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 + 5r = 0 + -8 Combine like terms: 8 + -8 = 0 0 + 5r = 0 + -8 5r = 0 + -8 Combine like terms: 0 + -8 = -8 5r = -8 Divide each side by '5'. r = -1.6 Simplifying r = -1.6Solution
r = {-1.6, -1.6}
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