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Simplifying r2 + 8r + 9 = 0 Reorder the terms: 9 + 8r + r2 = 0 Solving 9 + 8r + r2 = 0 Solving for variable 'r'. Begin completing the square. Move the constant term to the right: Add '-9' to each side of the equation. 9 + 8r + -9 + r2 = 0 + -9 Reorder the terms: 9 + -9 + 8r + r2 = 0 + -9 Combine like terms: 9 + -9 = 0 0 + 8r + r2 = 0 + -9 8r + r2 = 0 + -9 Combine like terms: 0 + -9 = -9 8r + r2 = -9 The r term is 8r. Take half its coefficient (4). Square it (16) and add it to both sides. Add '16' to each side of the equation. 8r + 16 + r2 = -9 + 16 Reorder the terms: 16 + 8r + r2 = -9 + 16 Combine like terms: -9 + 16 = 7 16 + 8r + r2 = 7 Factor a perfect square on the left side: (r + 4)(r + 4) = 7 Calculate the square root of the right side: 2.645751311 Break this problem into two subproblems by setting (r + 4) equal to 2.645751311 and -2.645751311.Subproblem 1
r + 4 = 2.645751311 Simplifying r + 4 = 2.645751311 Reorder the terms: 4 + r = 2.645751311 Solving 4 + r = 2.645751311 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + r = 2.645751311 + -4 Combine like terms: 4 + -4 = 0 0 + r = 2.645751311 + -4 r = 2.645751311 + -4 Combine like terms: 2.645751311 + -4 = -1.354248689 r = -1.354248689 Simplifying r = -1.354248689Subproblem 2
r + 4 = -2.645751311 Simplifying r + 4 = -2.645751311 Reorder the terms: 4 + r = -2.645751311 Solving 4 + r = -2.645751311 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + r = -2.645751311 + -4 Combine like terms: 4 + -4 = 0 0 + r = -2.645751311 + -4 r = -2.645751311 + -4 Combine like terms: -2.645751311 + -4 = -6.645751311 r = -6.645751311 Simplifying r = -6.645751311Solution
The solution to the problem is based on the solutions from the subproblems. r = {-1.354248689, -6.645751311}
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