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Simplifying r2 + 4r = -1 Reorder the terms: 4r + r2 = -1 Solving 4r + r2 = -1 Solving for variable 'r'. Reorder the terms: 1 + 4r + r2 = -1 + 1 Combine like terms: -1 + 1 = 0 1 + 4r + r2 = 0 Begin completing the square. Move the constant term to the right: Add '-1' to each side of the equation. 1 + 4r + -1 + r2 = 0 + -1 Reorder the terms: 1 + -1 + 4r + r2 = 0 + -1 Combine like terms: 1 + -1 = 0 0 + 4r + r2 = 0 + -1 4r + r2 = 0 + -1 Combine like terms: 0 + -1 = -1 4r + r2 = -1 The r term is 4r. Take half its coefficient (2). Square it (4) and add it to both sides. Add '4' to each side of the equation. 4r + 4 + r2 = -1 + 4 Reorder the terms: 4 + 4r + r2 = -1 + 4 Combine like terms: -1 + 4 = 3 4 + 4r + r2 = 3 Factor a perfect square on the left side: (r + 2)(r + 2) = 3 Calculate the square root of the right side: 1.732050808 Break this problem into two subproblems by setting (r + 2) equal to 1.732050808 and -1.732050808.Subproblem 1
r + 2 = 1.732050808 Simplifying r + 2 = 1.732050808 Reorder the terms: 2 + r = 1.732050808 Solving 2 + r = 1.732050808 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + r = 1.732050808 + -2 Combine like terms: 2 + -2 = 0 0 + r = 1.732050808 + -2 r = 1.732050808 + -2 Combine like terms: 1.732050808 + -2 = -0.267949192 r = -0.267949192 Simplifying r = -0.267949192Subproblem 2
r + 2 = -1.732050808 Simplifying r + 2 = -1.732050808 Reorder the terms: 2 + r = -1.732050808 Solving 2 + r = -1.732050808 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + r = -1.732050808 + -2 Combine like terms: 2 + -2 = 0 0 + r = -1.732050808 + -2 r = -1.732050808 + -2 Combine like terms: -1.732050808 + -2 = -3.732050808 r = -3.732050808 Simplifying r = -3.732050808Solution
The solution to the problem is based on the solutions from the subproblems. r = {-0.267949192, -3.732050808}
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