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Simplifying 4k2 + -5k + -1 = 0 Reorder the terms: -1 + -5k + 4k2 = 0 Solving -1 + -5k + 4k2 = 0 Solving for variable 'k'. Begin completing the square. Divide all terms by 4 the coefficient of the squared term: Divide each side by '4'. -0.25 + -1.25k + k2 = 0 Move the constant term to the right: Add '0.25' to each side of the equation. -0.25 + -1.25k + 0.25 + k2 = 0 + 0.25 Reorder the terms: -0.25 + 0.25 + -1.25k + k2 = 0 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + -1.25k + k2 = 0 + 0.25 -1.25k + k2 = 0 + 0.25 Combine like terms: 0 + 0.25 = 0.25 -1.25k + k2 = 0.25 The k term is -1.25k. Take half its coefficient (-0.625). Square it (0.390625) and add it to both sides. Add '0.390625' to each side of the equation. -1.25k + 0.390625 + k2 = 0.25 + 0.390625 Reorder the terms: 0.390625 + -1.25k + k2 = 0.25 + 0.390625 Combine like terms: 0.25 + 0.390625 = 0.640625 0.390625 + -1.25k + k2 = 0.640625 Factor a perfect square on the left side: (k + -0.625)(k + -0.625) = 0.640625 Calculate the square root of the right side: 0.80039053 Break this problem into two subproblems by setting (k + -0.625) equal to 0.80039053 and -0.80039053.Subproblem 1
k + -0.625 = 0.80039053 Simplifying k + -0.625 = 0.80039053 Reorder the terms: -0.625 + k = 0.80039053 Solving -0.625 + k = 0.80039053 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '0.625' to each side of the equation. -0.625 + 0.625 + k = 0.80039053 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + k = 0.80039053 + 0.625 k = 0.80039053 + 0.625 Combine like terms: 0.80039053 + 0.625 = 1.42539053 k = 1.42539053 Simplifying k = 1.42539053Subproblem 2
k + -0.625 = -0.80039053 Simplifying k + -0.625 = -0.80039053 Reorder the terms: -0.625 + k = -0.80039053 Solving -0.625 + k = -0.80039053 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '0.625' to each side of the equation. -0.625 + 0.625 + k = -0.80039053 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + k = -0.80039053 + 0.625 k = -0.80039053 + 0.625 Combine like terms: -0.80039053 + 0.625 = -0.17539053 k = -0.17539053 Simplifying k = -0.17539053Solution
The solution to the problem is based on the solutions from the subproblems. k = {1.42539053, -0.17539053}
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