2u^2-1-2u=0

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Solution for 2u^2-1-2u=0 equation:


Simplifying
2u2 + -1 + -2u = 0

Reorder the terms:
-1 + -2u + 2u2 = 0

Solving
-1 + -2u + 2u2 = 0

Solving for variable 'u'.

Begin completing the square.  Divide all terms by
2 the coefficient of the squared term: 

Divide each side by '2'.
-0.5 + -1u + u2 = 0

Move the constant term to the right:

Add '0.5' to each side of the equation.
-0.5 + -1u + 0.5 + u2 = 0 + 0.5

Reorder the terms:
-0.5 + 0.5 + -1u + u2 = 0 + 0.5

Combine like terms: -0.5 + 0.5 = 0.0
0.0 + -1u + u2 = 0 + 0.5
-1u + u2 = 0 + 0.5

Combine like terms: 0 + 0.5 = 0.5
-1u + u2 = 0.5

The u term is -1u.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1u + 0.25 + u2 = 0.5 + 0.25

Reorder the terms:
0.25 + -1u + u2 = 0.5 + 0.25

Combine like terms: 0.5 + 0.25 = 0.75
0.25 + -1u + u2 = 0.75

Factor a perfect square on the left side:
(u + -0.5)(u + -0.5) = 0.75

Calculate the square root of the right side: 0.866025404

Break this problem into two subproblems by setting 
(u + -0.5) equal to 0.866025404 and -0.866025404.

Subproblem 1

u + -0.5 = 0.866025404 Simplifying u + -0.5 = 0.866025404 Reorder the terms: -0.5 + u = 0.866025404 Solving -0.5 + u = 0.866025404 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + u = 0.866025404 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + u = 0.866025404 + 0.5 u = 0.866025404 + 0.5 Combine like terms: 0.866025404 + 0.5 = 1.366025404 u = 1.366025404 Simplifying u = 1.366025404

Subproblem 2

u + -0.5 = -0.866025404 Simplifying u + -0.5 = -0.866025404 Reorder the terms: -0.5 + u = -0.866025404 Solving -0.5 + u = -0.866025404 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + u = -0.866025404 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + u = -0.866025404 + 0.5 u = -0.866025404 + 0.5 Combine like terms: -0.866025404 + 0.5 = -0.366025404 u = -0.366025404 Simplifying u = -0.366025404

Solution

The solution to the problem is based on the solutions from the subproblems. u = {1.366025404, -0.366025404}

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