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Simplifying r2 = 6r + 9 Reorder the terms: r2 = 9 + 6r Solving r2 = 9 + 6r Solving for variable 'r'. Reorder the terms: -9 + -6r + r2 = 9 + 6r + -9 + -6r Reorder the terms: -9 + -6r + r2 = 9 + -9 + 6r + -6r Combine like terms: 9 + -9 = 0 -9 + -6r + r2 = 0 + 6r + -6r -9 + -6r + r2 = 6r + -6r Combine like terms: 6r + -6r = 0 -9 + -6r + r2 = 0 Begin completing the square. Move the constant term to the right: Add '9' to each side of the equation. -9 + -6r + 9 + r2 = 0 + 9 Reorder the terms: -9 + 9 + -6r + r2 = 0 + 9 Combine like terms: -9 + 9 = 0 0 + -6r + r2 = 0 + 9 -6r + r2 = 0 + 9 Combine like terms: 0 + 9 = 9 -6r + r2 = 9 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 = 9 + 9 Reorder the terms: 9 + -6r + r2 = 9 + 9 Combine like terms: 9 + 9 = 18 9 + -6r + r2 = 18 Factor a perfect square on the left side: (r + -3)(r + -3) = 18 Calculate the square root of the right side: 4.242640687 Break this problem into two subproblems by setting (r + -3) equal to 4.242640687 and -4.242640687.Subproblem 1
r + -3 = 4.242640687 Simplifying r + -3 = 4.242640687 Reorder the terms: -3 + r = 4.242640687 Solving -3 + r = 4.242640687 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 = 4.242640687 + 3 Combine like terms: -3 + 3 = 0 0 + r = 4.242640687 + 3 r = 4.242640687 + 3 Combine like terms: 4.242640687 + 3 = 7.242640687 r = 7.242640687 Simplifying r = 7.242640687Subproblem 2
r + -3 = -4.242640687 Simplifying r + -3 = -4.242640687 Reorder the terms: -3 + r = -4.242640687 Solving -3 + r = -4.242640687 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 = -4.242640687 + 3 Combine like terms: -3 + 3 = 0 0 + r = -4.242640687 + 3 r = -4.242640687 + 3 Combine like terms: -4.242640687 + 3 = -1.242640687 r = -1.242640687 Simplifying r = -1.242640687Solution
The solution to the problem is based on the solutions from the subproblems. r = {7.242640687, -1.242640687}
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