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Simplifying 3r2 + 5r + -18 = 0 Reorder the terms: -18 + 5r + 3r2 = 0 Solving -18 + 5r + 3r2 = 0 Solving for variable 'r'. Begin completing the square. Divide all terms by 3 the coefficient of the squared term: Divide each side by '3'. -6 + 1.666666667r + r2 = 0 Move the constant term to the right: Add '6' to each side of the equation. -6 + 1.666666667r + 6 + r2 = 0 + 6 Reorder the terms: -6 + 6 + 1.666666667r + r2 = 0 + 6 Combine like terms: -6 + 6 = 0 0 + 1.666666667r + r2 = 0 + 6 1.666666667r + r2 = 0 + 6 Combine like terms: 0 + 6 = 6 1.666666667r + r2 = 6 The r term is 1.666666667r. Take half its coefficient (0.8333333335). Square it (0.6944444447) and add it to both sides. Add '0.6944444447' to each side of the equation. 1.666666667r + 0.6944444447 + r2 = 6 + 0.6944444447 Reorder the terms: 0.6944444447 + 1.666666667r + r2 = 6 + 0.6944444447 Combine like terms: 6 + 0.6944444447 = 6.6944444447 0.6944444447 + 1.666666667r + r2 = 6.6944444447 Factor a perfect square on the left side: (r + 0.8333333335)(r + 0.8333333335) = 6.6944444447 Calculate the square root of the right side: 2.587362449 Break this problem into two subproblems by setting (r + 0.8333333335) equal to 2.587362449 and -2.587362449.Subproblem 1
r + 0.8333333335 = 2.587362449 Simplifying r + 0.8333333335 = 2.587362449 Reorder the terms: 0.8333333335 + r = 2.587362449 Solving 0.8333333335 + r = 2.587362449 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-0.8333333335' to each side of the equation. 0.8333333335 + -0.8333333335 + r = 2.587362449 + -0.8333333335 Combine like terms: 0.8333333335 + -0.8333333335 = 0.0000000000 0.0000000000 + r = 2.587362449 + -0.8333333335 r = 2.587362449 + -0.8333333335 Combine like terms: 2.587362449 + -0.8333333335 = 1.7540291155 r = 1.7540291155 Simplifying r = 1.7540291155Subproblem 2
r + 0.8333333335 = -2.587362449 Simplifying r + 0.8333333335 = -2.587362449 Reorder the terms: 0.8333333335 + r = -2.587362449 Solving 0.8333333335 + r = -2.587362449 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-0.8333333335' to each side of the equation. 0.8333333335 + -0.8333333335 + r = -2.587362449 + -0.8333333335 Combine like terms: 0.8333333335 + -0.8333333335 = 0.0000000000 0.0000000000 + r = -2.587362449 + -0.8333333335 r = -2.587362449 + -0.8333333335 Combine like terms: -2.587362449 + -0.8333333335 = -3.4206957825 r = -3.4206957825 Simplifying r = -3.4206957825Solution
The solution to the problem is based on the solutions from the subproblems. r = {1.7540291155, -3.4206957825}
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