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Simplifying r2 + 10r = -7 Reorder the terms: 10r + r2 = -7 Solving 10r + r2 = -7 Solving for variable 'r'. Reorder the terms: 7 + 10r + r2 = -7 + 7 Combine like terms: -7 + 7 = 0 7 + 10r + r2 = 0 Begin completing the square. Move the constant term to the right: Add '-7' to each side of the equation. 7 + 10r + -7 + r2 = 0 + -7 Reorder the terms: 7 + -7 + 10r + r2 = 0 + -7 Combine like terms: 7 + -7 = 0 0 + 10r + r2 = 0 + -7 10r + r2 = 0 + -7 Combine like terms: 0 + -7 = -7 10r + r2 = -7 The r term is 10r. Take half its coefficient (5). Square it (25) and add it to both sides. Add '25' to each side of the equation. 10r + 25 + r2 = -7 + 25 Reorder the terms: 25 + 10r + r2 = -7 + 25 Combine like terms: -7 + 25 = 18 25 + 10r + r2 = 18 Factor a perfect square on the left side: (r + 5)(r + 5) = 18 Calculate the square root of the right side: 4.242640687 Break this problem into two subproblems by setting (r + 5) equal to 4.242640687 and -4.242640687.Subproblem 1
r + 5 = 4.242640687 Simplifying r + 5 = 4.242640687 Reorder the terms: 5 + r = 4.242640687 Solving 5 + r = 4.242640687 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + r = 4.242640687 + -5 Combine like terms: 5 + -5 = 0 0 + r = 4.242640687 + -5 r = 4.242640687 + -5 Combine like terms: 4.242640687 + -5 = -0.757359313 r = -0.757359313 Simplifying r = -0.757359313Subproblem 2
r + 5 = -4.242640687 Simplifying r + 5 = -4.242640687 Reorder the terms: 5 + r = -4.242640687 Solving 5 + r = -4.242640687 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + r = -4.242640687 + -5 Combine like terms: 5 + -5 = 0 0 + r = -4.242640687 + -5 r = -4.242640687 + -5 Combine like terms: -4.242640687 + -5 = -9.242640687 r = -9.242640687 Simplifying r = -9.242640687Solution
The solution to the problem is based on the solutions from the subproblems. r = {-0.757359313, -9.242640687}
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