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Simplifying 5r2 + -2 = r Reorder the terms: -2 + 5r2 = r Solving -2 + 5r2 = r Solving for variable 'r'. Reorder the terms: -2 + -1r + 5r2 = r + -1r Combine like terms: r + -1r = 0 -2 + -1r + 5r2 = 0 Begin completing the square. Divide all terms by 5 the coefficient of the squared term: Divide each side by '5'. -0.4 + -0.2r + r2 = 0 Move the constant term to the right: Add '0.4' to each side of the equation. -0.4 + -0.2r + 0.4 + r2 = 0 + 0.4 Reorder the terms: -0.4 + 0.4 + -0.2r + r2 = 0 + 0.4 Combine like terms: -0.4 + 0.4 = 0.0 0.0 + -0.2r + r2 = 0 + 0.4 -0.2r + r2 = 0 + 0.4 Combine like terms: 0 + 0.4 = 0.4 -0.2r + r2 = 0.4 The r term is -0.2r. Take half its coefficient (-0.1). Square it (0.01) and add it to both sides. Add '0.01' to each side of the equation. -0.2r + 0.01 + r2 = 0.4 + 0.01 Reorder the terms: 0.01 + -0.2r + r2 = 0.4 + 0.01 Combine like terms: 0.4 + 0.01 = 0.41 0.01 + -0.2r + r2 = 0.41 Factor a perfect square on the left side: (r + -0.1)(r + -0.1) = 0.41 Calculate the square root of the right side: 0.640312424 Break this problem into two subproblems by setting (r + -0.1) equal to 0.640312424 and -0.640312424.Subproblem 1
r + -0.1 = 0.640312424 Simplifying r + -0.1 = 0.640312424 Reorder the terms: -0.1 + r = 0.640312424 Solving -0.1 + r = 0.640312424 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '0.1' to each side of the equation. -0.1 + 0.1 + r = 0.640312424 + 0.1 Combine like terms: -0.1 + 0.1 = 0.0 0.0 + r = 0.640312424 + 0.1 r = 0.640312424 + 0.1 Combine like terms: 0.640312424 + 0.1 = 0.740312424 r = 0.740312424 Simplifying r = 0.740312424Subproblem 2
r + -0.1 = -0.640312424 Simplifying r + -0.1 = -0.640312424 Reorder the terms: -0.1 + r = -0.640312424 Solving -0.1 + r = -0.640312424 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '0.1' to each side of the equation. -0.1 + 0.1 + r = -0.640312424 + 0.1 Combine like terms: -0.1 + 0.1 = 0.0 0.0 + r = -0.640312424 + 0.1 r = -0.640312424 + 0.1 Combine like terms: -0.640312424 + 0.1 = -0.540312424 r = -0.540312424 Simplifying r = -0.540312424Solution
The solution to the problem is based on the solutions from the subproblems. r = {0.740312424, -0.540312424}
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