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Simplifying -4r2 + 10r + 3 = 0 Reorder the terms: 3 + 10r + -4r2 = 0 Solving 3 + 10r + -4r2 = 0 Solving for variable 'r'. Begin completing the square. Divide all terms by -4 the coefficient of the squared term: Divide each side by '-4'. -0.75 + -2.5r + r2 = 0 Move the constant term to the right: Add '0.75' to each side of the equation. -0.75 + -2.5r + 0.75 + r2 = 0 + 0.75 Reorder the terms: -0.75 + 0.75 + -2.5r + r2 = 0 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + -2.5r + r2 = 0 + 0.75 -2.5r + r2 = 0 + 0.75 Combine like terms: 0 + 0.75 = 0.75 -2.5r + r2 = 0.75 The r term is -2.5r. Take half its coefficient (-1.25). Square it (1.5625) and add it to both sides. Add '1.5625' to each side of the equation. -2.5r + 1.5625 + r2 = 0.75 + 1.5625 Reorder the terms: 1.5625 + -2.5r + r2 = 0.75 + 1.5625 Combine like terms: 0.75 + 1.5625 = 2.3125 1.5625 + -2.5r + r2 = 2.3125 Factor a perfect square on the left side: (r + -1.25)(r + -1.25) = 2.3125 Calculate the square root of the right side: 1.520690633 Break this problem into two subproblems by setting (r + -1.25) equal to 1.520690633 and -1.520690633.Subproblem 1
r + -1.25 = 1.520690633 Simplifying r + -1.25 = 1.520690633 Reorder the terms: -1.25 + r = 1.520690633 Solving -1.25 + r = 1.520690633 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + r = 1.520690633 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + r = 1.520690633 + 1.25 r = 1.520690633 + 1.25 Combine like terms: 1.520690633 + 1.25 = 2.770690633 r = 2.770690633 Simplifying r = 2.770690633Subproblem 2
r + -1.25 = -1.520690633 Simplifying r + -1.25 = -1.520690633 Reorder the terms: -1.25 + r = -1.520690633 Solving -1.25 + r = -1.520690633 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + r = -1.520690633 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + r = -1.520690633 + 1.25 r = -1.520690633 + 1.25 Combine like terms: -1.520690633 + 1.25 = -0.270690633 r = -0.270690633 Simplifying r = -0.270690633Solution
The solution to the problem is based on the solutions from the subproblems. r = {2.770690633, -0.270690633}
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