3u^2-3u-1=0

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Solution for 3u^2-3u-1=0 equation:


Simplifying
3u2 + -3u + -1 = 0

Reorder the terms:
-1 + -3u + 3u2 = 0

Solving
-1 + -3u + 3u2 = 0

Solving for variable 'u'.

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

Divide each side by '3'.
-0.3333333333 + -1u + u2 = 0

Move the constant term to the right:

Add '0.3333333333' to each side of the equation.
-0.3333333333 + -1u + 0.3333333333 + u2 = 0 + 0.3333333333

Reorder the terms:
-0.3333333333 + 0.3333333333 + -1u + u2 = 0 + 0.3333333333

Combine like terms: -0.3333333333 + 0.3333333333 = 0.0000000000
0.0000000000 + -1u + u2 = 0 + 0.3333333333
-1u + u2 = 0 + 0.3333333333

Combine like terms: 0 + 0.3333333333 = 0.3333333333
-1u + u2 = 0.3333333333

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 = 0.3333333333 + 0.25

Reorder the terms:
0.25 + -1u + u2 = 0.3333333333 + 0.25

Combine like terms: 0.3333333333 + 0.25 = 0.5833333333
0.25 + -1u + u2 = 0.5833333333

Factor a perfect square on the left side:
(u + -0.5)(u + -0.5) = 0.5833333333

Calculate the square root of the right side: 0.763762616

Break this problem into two subproblems by setting 
(u + -0.5) equal to 0.763762616 and -0.763762616.

Subproblem 1

u + -0.5 = 0.763762616 Simplifying u + -0.5 = 0.763762616 Reorder the terms: -0.5 + u = 0.763762616 Solving -0.5 + u = 0.763762616 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 = 0.763762616 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + u = 0.763762616 + 0.5 u = 0.763762616 + 0.5 Combine like terms: 0.763762616 + 0.5 = 1.263762616 u = 1.263762616 Simplifying u = 1.263762616

Subproblem 2

u + -0.5 = -0.763762616 Simplifying u + -0.5 = -0.763762616 Reorder the terms: -0.5 + u = -0.763762616 Solving -0.5 + u = -0.763762616 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 = -0.763762616 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + u = -0.763762616 + 0.5 u = -0.763762616 + 0.5 Combine like terms: -0.763762616 + 0.5 = -0.263762616 u = -0.263762616 Simplifying u = -0.263762616

Solution

The solution to the problem is based on the solutions from the subproblems. u = {1.263762616, -0.263762616}

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