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Simplifying r2 + -1r + -10 = 0 Reorder the terms: -10 + -1r + r2 = 0 Solving -10 + -1r + r2 = 0 Solving for variable 'r'. Begin completing the square. Move the constant term to the right: Add '10' to each side of the equation. -10 + -1r + 10 + r2 = 0 + 10 Reorder the terms: -10 + 10 + -1r + r2 = 0 + 10 Combine like terms: -10 + 10 = 0 0 + -1r + r2 = 0 + 10 -1r + r2 = 0 + 10 Combine like terms: 0 + 10 = 10 -1r + r2 = 10 The r term is -1r. Take half its coefficient (-0.5). Square it (0.25) and add it to both sides. Add '0.25' to each side of the equation. -1r + 0.25 + r2 = 10 + 0.25 Reorder the terms: 0.25 + -1r + r2 = 10 + 0.25 Combine like terms: 10 + 0.25 = 10.25 0.25 + -1r + r2 = 10.25 Factor a perfect square on the left side: (r + -0.5)(r + -0.5) = 10.25 Calculate the square root of the right side: 3.201562119 Break this problem into two subproblems by setting (r + -0.5) equal to 3.201562119 and -3.201562119.Subproblem 1
r + -0.5 = 3.201562119 Simplifying r + -0.5 = 3.201562119 Reorder the terms: -0.5 + r = 3.201562119 Solving -0.5 + r = 3.201562119 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + r = 3.201562119 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + r = 3.201562119 + 0.5 r = 3.201562119 + 0.5 Combine like terms: 3.201562119 + 0.5 = 3.701562119 r = 3.701562119 Simplifying r = 3.701562119Subproblem 2
r + -0.5 = -3.201562119 Simplifying r + -0.5 = -3.201562119 Reorder the terms: -0.5 + r = -3.201562119 Solving -0.5 + r = -3.201562119 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + r = -3.201562119 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + r = -3.201562119 + 0.5 r = -3.201562119 + 0.5 Combine like terms: -3.201562119 + 0.5 = -2.701562119 r = -2.701562119 Simplifying r = -2.701562119Solution
The solution to the problem is based on the solutions from the subproblems. r = {3.701562119, -2.701562119}
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