5u^2-18u-3=0

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Solution for 5u^2-18u-3=0 equation:


Simplifying
5u2 + -18u + -3 = 0

Reorder the terms:
-3 + -18u + 5u2 = 0

Solving
-3 + -18u + 5u2 = 0

Solving for variable 'u'.

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

Divide each side by '5'.
-0.6 + -3.6u + u2 = 0

Move the constant term to the right:

Add '0.6' to each side of the equation.
-0.6 + -3.6u + 0.6 + u2 = 0 + 0.6

Reorder the terms:
-0.6 + 0.6 + -3.6u + u2 = 0 + 0.6

Combine like terms: -0.6 + 0.6 = 0.0
0.0 + -3.6u + u2 = 0 + 0.6
-3.6u + u2 = 0 + 0.6

Combine like terms: 0 + 0.6 = 0.6
-3.6u + u2 = 0.6

The u term is -3.6u.  Take half its coefficient (-1.8).
Square it (3.24) and add it to both sides.

Add '3.24' to each side of the equation.
-3.6u + 3.24 + u2 = 0.6 + 3.24

Reorder the terms:
3.24 + -3.6u + u2 = 0.6 + 3.24

Combine like terms: 0.6 + 3.24 = 3.84
3.24 + -3.6u + u2 = 3.84

Factor a perfect square on the left side:
(u + -1.8)(u + -1.8) = 3.84

Calculate the square root of the right side: 1.959591794

Break this problem into two subproblems by setting 
(u + -1.8) equal to 1.959591794 and -1.959591794.

Subproblem 1

u + -1.8 = 1.959591794 Simplifying u + -1.8 = 1.959591794 Reorder the terms: -1.8 + u = 1.959591794 Solving -1.8 + u = 1.959591794 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '1.8' to each side of the equation. -1.8 + 1.8 + u = 1.959591794 + 1.8 Combine like terms: -1.8 + 1.8 = 0.0 0.0 + u = 1.959591794 + 1.8 u = 1.959591794 + 1.8 Combine like terms: 1.959591794 + 1.8 = 3.759591794 u = 3.759591794 Simplifying u = 3.759591794

Subproblem 2

u + -1.8 = -1.959591794 Simplifying u + -1.8 = -1.959591794 Reorder the terms: -1.8 + u = -1.959591794 Solving -1.8 + u = -1.959591794 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '1.8' to each side of the equation. -1.8 + 1.8 + u = -1.959591794 + 1.8 Combine like terms: -1.8 + 1.8 = 0.0 0.0 + u = -1.959591794 + 1.8 u = -1.959591794 + 1.8 Combine like terms: -1.959591794 + 1.8 = -0.159591794 u = -0.159591794 Simplifying u = -0.159591794

Solution

The solution to the problem is based on the solutions from the subproblems. u = {3.759591794, -0.159591794}

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