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Simplifying 3r2 + -9r = 5 Reorder the terms: -9r + 3r2 = 5 Solving -9r + 3r2 = 5 Solving for variable 'r'. Reorder the terms: -5 + -9r + 3r2 = 5 + -5 Combine like terms: 5 + -5 = 0 -5 + -9r + 3r2 = 0 Begin completing the square. Divide all terms by 3 the coefficient of the squared term: Divide each side by '3'. -1.666666667 + -3r + r2 = 0 Move the constant term to the right: Add '1.666666667' to each side of the equation. -1.666666667 + -3r + 1.666666667 + r2 = 0 + 1.666666667 Reorder the terms: -1.666666667 + 1.666666667 + -3r + r2 = 0 + 1.666666667 Combine like terms: -1.666666667 + 1.666666667 = 0.000000000 0.000000000 + -3r + r2 = 0 + 1.666666667 -3r + r2 = 0 + 1.666666667 Combine like terms: 0 + 1.666666667 = 1.666666667 -3r + r2 = 1.666666667 The r term is -3r. Take half its coefficient (-1.5). Square it (2.25) and add it to both sides. Add '2.25' to each side of the equation. -3r + 2.25 + r2 = 1.666666667 + 2.25 Reorder the terms: 2.25 + -3r + r2 = 1.666666667 + 2.25 Combine like terms: 1.666666667 + 2.25 = 3.916666667 2.25 + -3r + r2 = 3.916666667 Factor a perfect square on the left side: (r + -1.5)(r + -1.5) = 3.916666667 Calculate the square root of the right side: 1.979057015 Break this problem into two subproblems by setting (r + -1.5) equal to 1.979057015 and -1.979057015.Subproblem 1
r + -1.5 = 1.979057015 Simplifying r + -1.5 = 1.979057015 Reorder the terms: -1.5 + r = 1.979057015 Solving -1.5 + r = 1.979057015 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + r = 1.979057015 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + r = 1.979057015 + 1.5 r = 1.979057015 + 1.5 Combine like terms: 1.979057015 + 1.5 = 3.479057015 r = 3.479057015 Simplifying r = 3.479057015Subproblem 2
r + -1.5 = -1.979057015 Simplifying r + -1.5 = -1.979057015 Reorder the terms: -1.5 + r = -1.979057015 Solving -1.5 + r = -1.979057015 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + r = -1.979057015 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + r = -1.979057015 + 1.5 r = -1.979057015 + 1.5 Combine like terms: -1.979057015 + 1.5 = -0.479057015 r = -0.479057015 Simplifying r = -0.479057015Solution
The solution to the problem is based on the solutions from the subproblems. r = {3.479057015, -0.479057015}
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