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Simplifying (r + -2)(r + 8) = -5 Reorder the terms: (-2 + r)(r + 8) = -5 Reorder the terms: (-2 + r)(8 + r) = -5 Multiply (-2 + r) * (8 + r) (-2(8 + r) + r(8 + r)) = -5 ((8 * -2 + r * -2) + r(8 + r)) = -5 ((-16 + -2r) + r(8 + r)) = -5 (-16 + -2r + (8 * r + r * r)) = -5 (-16 + -2r + (8r + r2)) = -5 Combine like terms: -2r + 8r = 6r (-16 + 6r + r2) = -5 Solving -16 + 6r + r2 = -5 Solving for variable 'r'. Reorder the terms: -16 + 5 + 6r + r2 = -5 + 5 Combine like terms: -16 + 5 = -11 -11 + 6r + r2 = -5 + 5 Combine like terms: -5 + 5 = 0 -11 + 6r + r2 = 0 Begin completing the square. Move the constant term to the right: Add '11' to each side of the equation. -11 + 6r + 11 + r2 = 0 + 11 Reorder the terms: -11 + 11 + 6r + r2 = 0 + 11 Combine like terms: -11 + 11 = 0 0 + 6r + r2 = 0 + 11 6r + r2 = 0 + 11 Combine like terms: 0 + 11 = 11 6r + r2 = 11 The r term is 6r. Take half its coefficient (3). Square it (9) and add it to both sides. Add '9' to each side of the equation. 6r + 9 + r2 = 11 + 9 Reorder the terms: 9 + 6r + r2 = 11 + 9 Combine like terms: 11 + 9 = 20 9 + 6r + r2 = 20 Factor a perfect square on the left side: (r + 3)(r + 3) = 20 Calculate the square root of the right side: 4.472135955 Break this problem into two subproblems by setting (r + 3) equal to 4.472135955 and -4.472135955.Subproblem 1
r + 3 = 4.472135955 Simplifying r + 3 = 4.472135955 Reorder the terms: 3 + r = 4.472135955 Solving 3 + r = 4.472135955 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + r = 4.472135955 + -3 Combine like terms: 3 + -3 = 0 0 + r = 4.472135955 + -3 r = 4.472135955 + -3 Combine like terms: 4.472135955 + -3 = 1.472135955 r = 1.472135955 Simplifying r = 1.472135955Subproblem 2
r + 3 = -4.472135955 Simplifying r + 3 = -4.472135955 Reorder the terms: 3 + r = -4.472135955 Solving 3 + r = -4.472135955 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + r = -4.472135955 + -3 Combine like terms: 3 + -3 = 0 0 + r = -4.472135955 + -3 r = -4.472135955 + -3 Combine like terms: -4.472135955 + -3 = -7.472135955 r = -7.472135955 Simplifying r = -7.472135955Solution
The solution to the problem is based on the solutions from the subproblems. r = {1.472135955, -7.472135955}
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