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Simplifying 2r2 + 4r + -5 = 0 Reorder the terms: -5 + 4r + 2r2 = 0 Solving -5 + 4r + 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'. -2.5 + 2r + r2 = 0 Move the constant term to the right: Add '2.5' to each side of the equation. -2.5 + 2r + 2.5 + r2 = 0 + 2.5 Reorder the terms: -2.5 + 2.5 + 2r + r2 = 0 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + 2r + r2 = 0 + 2.5 2r + r2 = 0 + 2.5 Combine like terms: 0 + 2.5 = 2.5 2r + r2 = 2.5 The r term is 2r. Take half its coefficient (1). Square it (1) and add it to both sides. Add '1' to each side of the equation. 2r + 1 + r2 = 2.5 + 1 Reorder the terms: 1 + 2r + r2 = 2.5 + 1 Combine like terms: 2.5 + 1 = 3.5 1 + 2r + r2 = 3.5 Factor a perfect square on the left side: (r + 1)(r + 1) = 3.5 Calculate the square root of the right side: 1.870828693 Break this problem into two subproblems by setting (r + 1) equal to 1.870828693 and -1.870828693.Subproblem 1
r + 1 = 1.870828693 Simplifying r + 1 = 1.870828693 Reorder the terms: 1 + r = 1.870828693 Solving 1 + r = 1.870828693 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + r = 1.870828693 + -1 Combine like terms: 1 + -1 = 0 0 + r = 1.870828693 + -1 r = 1.870828693 + -1 Combine like terms: 1.870828693 + -1 = 0.870828693 r = 0.870828693 Simplifying r = 0.870828693Subproblem 2
r + 1 = -1.870828693 Simplifying r + 1 = -1.870828693 Reorder the terms: 1 + r = -1.870828693 Solving 1 + r = -1.870828693 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + r = -1.870828693 + -1 Combine like terms: 1 + -1 = 0 0 + r = -1.870828693 + -1 r = -1.870828693 + -1 Combine like terms: -1.870828693 + -1 = -2.870828693 r = -2.870828693 Simplifying r = -2.870828693Solution
The solution to the problem is based on the solutions from the subproblems. r = {0.870828693, -2.870828693}
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