u^2-13u-4=0

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Solution for u^2-13u-4=0 equation: 


Simplifying
u2 + -13u + -4 = 0

Reorder the terms:
-4 + -13u + u2 = 0

Solving
-4 + -13u + u2 = 0

Solving for variable 'u'.

Begin completing the square.

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + -13u + 4 + u2 = 0 + 4

Reorder the terms:
-4 + 4 + -13u + u2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + -13u + u2 = 0 + 4
-13u + u2 = 0 + 4

Combine like terms: 0 + 4 = 4
-13u + u2 = 4

The u term is -13u.  Take half its coefficient (-6.5).
Square it (42.25) and add it to both sides.

Add '42.25' to each side of the equation.
-13u + 42.25 + u2 = 4 + 42.25

Reorder the terms:
42.25 + -13u + u2 = 4 + 42.25

Combine like terms: 4 + 42.25 = 46.25
42.25 + -13u + u2 = 46.25

Factor a perfect square on the left side:
(u + -6.5)(u + -6.5) = 46.25

Calculate the square root of the right side: 6.800735254

Break this problem into two subproblems by setting 
(u + -6.5) equal to 6.800735254 and -6.800735254.


Subproblem 1
u + -6.5 = 6.800735254

Simplifying
u + -6.5 = 6.800735254

Reorder the terms:
-6.5 + u = 6.800735254

Solving
-6.5 + u = 6.800735254

Solving for variable 'u'.

Move all terms containing u to the left, all other terms to the right.

Add '6.5' to each side of the equation.
-6.5 + 6.5 + u = 6.800735254 + 6.5

Combine like terms: -6.5 + 6.5 = 0.0
0.0 + u = 6.800735254 + 6.5
u = 6.800735254 + 6.5

Combine like terms: 6.800735254 + 6.5 = 13.300735254
u = 13.300735254

Simplifying
u = 13.300735254


Subproblem 2
u + -6.5 = -6.800735254

Simplifying
u + -6.5 = -6.800735254

Reorder the terms:
-6.5 + u = -6.800735254

Solving
-6.5 + u = -6.800735254

Solving for variable 'u'.

Move all terms containing u to the left, all other terms to the right.

Add '6.5' to each side of the equation.
-6.5 + 6.5 + u = -6.800735254 + 6.5

Combine like terms: -6.5 + 6.5 = 0.0
0.0 + u = -6.800735254 + 6.5
u = -6.800735254 + 6.5

Combine like terms: -6.800735254 + 6.5 = -0.300735254
u = -0.300735254

Simplifying
u = -0.300735254


Solution
The solution to the problem is based on the solutions
from the subproblems.
u = {13.300735254, -0.300735254}

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