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Simplifying 20r2 = 64 + 64r Solving 20r2 = 64 + 64r Solving for variable 'r'. Reorder the terms: -64 + -64r + 20r2 = 64 + 64r + -64 + -64r Reorder the terms: -64 + -64r + 20r2 = 64 + -64 + 64r + -64r Combine like terms: 64 + -64 = 0 -64 + -64r + 20r2 = 0 + 64r + -64r -64 + -64r + 20r2 = 64r + -64r Combine like terms: 64r + -64r = 0 -64 + -64r + 20r2 = 0 Factor out the Greatest Common Factor (GCF), '4'. 4(-16 + -16r + 5r2) = 0 Factor a trinomial. 4((-4 + -5r)(4 + -1r)) = 0 Ignore the factor 4.Subproblem 1
Set the factor '(-4 + -5r)' equal to zero and attempt to solve: Simplifying -4 + -5r = 0 Solving -4 + -5r = 0 Move all terms containing r to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + -5r = 0 + 4 Combine like terms: -4 + 4 = 0 0 + -5r = 0 + 4 -5r = 0 + 4 Combine like terms: 0 + 4 = 4 -5r = 4 Divide each side by '-5'. r = -0.8 Simplifying r = -0.8Subproblem 2
Set the factor '(4 + -1r)' equal to zero and attempt to solve: Simplifying 4 + -1r = 0 Solving 4 + -1r = 0 Move all terms containing r to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + -1r = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -1r = 0 + -4 -1r = 0 + -4 Combine like terms: 0 + -4 = -4 -1r = -4 Divide each side by '-1'. r = 4 Simplifying r = 4Solution
r = {-0.8, 4}
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