3u^2-5u-3=0

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Solution for 3u^2-5u-3=0 equation:


Simplifying
3u2 + -5u + -3 = 0

Reorder the terms:
-3 + -5u + 3u2 = 0

Solving
-3 + -5u + 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'.
-1 + -1.666666667u + u2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + -1.666666667u + 1 + u2 = 0 + 1

Reorder the terms:
-1 + 1 + -1.666666667u + u2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -1.666666667u + u2 = 0 + 1
-1.666666667u + u2 = 0 + 1

Combine like terms: 0 + 1 = 1
-1.666666667u + u2 = 1

The u term is -1.666666667u.  Take half its coefficient (-0.8333333335).
Square it (0.6944444447) and add it to both sides.

Add '0.6944444447' to each side of the equation.
-1.666666667u + 0.6944444447 + u2 = 1 + 0.6944444447

Reorder the terms:
0.6944444447 + -1.666666667u + u2 = 1 + 0.6944444447

Combine like terms: 1 + 0.6944444447 = 1.6944444447
0.6944444447 + -1.666666667u + u2 = 1.6944444447

Factor a perfect square on the left side:
(u + -0.8333333335)(u + -0.8333333335) = 1.6944444447

Calculate the square root of the right side: 1.301708279

Break this problem into two subproblems by setting 
(u + -0.8333333335) equal to 1.301708279 and -1.301708279.

Subproblem 1

u + -0.8333333335 = 1.301708279 Simplifying u + -0.8333333335 = 1.301708279 Reorder the terms: -0.8333333335 + u = 1.301708279 Solving -0.8333333335 + u = 1.301708279 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '0.8333333335' to each side of the equation. -0.8333333335 + 0.8333333335 + u = 1.301708279 + 0.8333333335 Combine like terms: -0.8333333335 + 0.8333333335 = 0.0000000000 0.0000000000 + u = 1.301708279 + 0.8333333335 u = 1.301708279 + 0.8333333335 Combine like terms: 1.301708279 + 0.8333333335 = 2.1350416125 u = 2.1350416125 Simplifying u = 2.1350416125

Subproblem 2

u + -0.8333333335 = -1.301708279 Simplifying u + -0.8333333335 = -1.301708279 Reorder the terms: -0.8333333335 + u = -1.301708279 Solving -0.8333333335 + u = -1.301708279 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '0.8333333335' to each side of the equation. -0.8333333335 + 0.8333333335 + u = -1.301708279 + 0.8333333335 Combine like terms: -0.8333333335 + 0.8333333335 = 0.0000000000 0.0000000000 + u = -1.301708279 + 0.8333333335 u = -1.301708279 + 0.8333333335 Combine like terms: -1.301708279 + 0.8333333335 = -0.4683749455 u = -0.4683749455 Simplifying u = -0.4683749455

Solution

The solution to the problem is based on the solutions from the subproblems. u = {2.1350416125, -0.4683749455}

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