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Simplifying 2r2 + -3r + -1 = 0 Reorder the terms: -1 + -3r + 2r2 = 0 Solving -1 + -3r + 2r2 = 0 Solving for variable 'r'. Begin completing the square. Divide all terms by 2 the coefficient of the squared term: Divide each side by '2'. -0.5 + -1.5r + r2 = 0 Move the constant term to the right: Add '0.5' to each side of the equation. -0.5 + -1.5r + 0.5 + r2 = 0 + 0.5 Reorder the terms: -0.5 + 0.5 + -1.5r + r2 = 0 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + -1.5r + r2 = 0 + 0.5 -1.5r + r2 = 0 + 0.5 Combine like terms: 0 + 0.5 = 0.5 -1.5r + r2 = 0.5 The r term is -1.5r. Take half its coefficient (-0.75). Square it (0.5625) and add it to both sides. Add '0.5625' to each side of the equation. -1.5r + 0.5625 + r2 = 0.5 + 0.5625 Reorder the terms: 0.5625 + -1.5r + r2 = 0.5 + 0.5625 Combine like terms: 0.5 + 0.5625 = 1.0625 0.5625 + -1.5r + r2 = 1.0625 Factor a perfect square on the left side: (r + -0.75)(r + -0.75) = 1.0625 Calculate the square root of the right side: 1.030776406 Break this problem into two subproblems by setting (r + -0.75) equal to 1.030776406 and -1.030776406.Subproblem 1
r + -0.75 = 1.030776406 Simplifying r + -0.75 = 1.030776406 Reorder the terms: -0.75 + r = 1.030776406 Solving -0.75 + r = 1.030776406 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + r = 1.030776406 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + r = 1.030776406 + 0.75 r = 1.030776406 + 0.75 Combine like terms: 1.030776406 + 0.75 = 1.780776406 r = 1.780776406 Simplifying r = 1.780776406Subproblem 2
r + -0.75 = -1.030776406 Simplifying r + -0.75 = -1.030776406 Reorder the terms: -0.75 + r = -1.030776406 Solving -0.75 + r = -1.030776406 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + r = -1.030776406 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + r = -1.030776406 + 0.75 r = -1.030776406 + 0.75 Combine like terms: -1.030776406 + 0.75 = -0.280776406 r = -0.280776406 Simplifying r = -0.280776406Solution
The solution to the problem is based on the solutions from the subproblems. r = {1.780776406, -0.280776406}
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