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Simplifying -4u2 + 20u + -1 = 0 Reorder the terms: -1 + 20u + -4u2 = 0 Solving -1 + 20u + -4u2 = 0 Solving for variable 'u'. Begin completing the square. Divide all terms by -4 the coefficient of the squared term: Divide each side by '-4'. 0.25 + -5u + u2 = 0 Move the constant term to the right: Add '-0.25' to each side of the equation. 0.25 + -5u + -0.25 + u2 = 0 + -0.25 Reorder the terms: 0.25 + -0.25 + -5u + u2 = 0 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + -5u + u2 = 0 + -0.25 -5u + u2 = 0 + -0.25 Combine like terms: 0 + -0.25 = -0.25 -5u + u2 = -0.25 The u term is -5u. Take half its coefficient (-2.5). Square it (6.25) and add it to both sides. Add '6.25' to each side of the equation. -5u + 6.25 + u2 = -0.25 + 6.25 Reorder the terms: 6.25 + -5u + u2 = -0.25 + 6.25 Combine like terms: -0.25 + 6.25 = 6 6.25 + -5u + u2 = 6 Factor a perfect square on the left side: (u + -2.5)(u + -2.5) = 6 Calculate the square root of the right side: 2.449489743 Break this problem into two subproblems by setting (u + -2.5) equal to 2.449489743 and -2.449489743.Subproblem 1
u + -2.5 = 2.449489743 Simplifying u + -2.5 = 2.449489743 Reorder the terms: -2.5 + u = 2.449489743 Solving -2.5 + u = 2.449489743 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + u = 2.449489743 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + u = 2.449489743 + 2.5 u = 2.449489743 + 2.5 Combine like terms: 2.449489743 + 2.5 = 4.949489743 u = 4.949489743 Simplifying u = 4.949489743Subproblem 2
u + -2.5 = -2.449489743 Simplifying u + -2.5 = -2.449489743 Reorder the terms: -2.5 + u = -2.449489743 Solving -2.5 + u = -2.449489743 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + u = -2.449489743 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + u = -2.449489743 + 2.5 u = -2.449489743 + 2.5 Combine like terms: -2.449489743 + 2.5 = 0.050510257 u = 0.050510257 Simplifying u = 0.050510257Solution
The solution to the problem is based on the solutions from the subproblems. u = {4.949489743, 0.050510257}
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