u^2-6u-6=0

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Solution for u^2-6u-6=0 equation:


Simplifying
u2 + -6u + -6 = 0

Reorder the terms:
-6 + -6u + u2 = 0

Solving
-6 + -6u + u2 = 0

Solving for variable 'u'.

Begin completing the square.

Move the constant term to the right:

Add '6' to each side of the equation.
-6 + -6u + 6 + u2 = 0 + 6

Reorder the terms:
-6 + 6 + -6u + u2 = 0 + 6

Combine like terms: -6 + 6 = 0
0 + -6u + u2 = 0 + 6
-6u + u2 = 0 + 6

Combine like terms: 0 + 6 = 6
-6u + u2 = 6

The u term is -6u.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6u + 9 + u2 = 6 + 9

Reorder the terms:
9 + -6u + u2 = 6 + 9

Combine like terms: 6 + 9 = 15
9 + -6u + u2 = 15

Factor a perfect square on the left side:
(u + -3)(u + -3) = 15

Calculate the square root of the right side: 3.872983346

Break this problem into two subproblems by setting 
(u + -3) equal to 3.872983346 and -3.872983346.

Subproblem 1

u + -3 = 3.872983346 Simplifying u + -3 = 3.872983346 Reorder the terms: -3 + u = 3.872983346 Solving -3 + u = 3.872983346 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + u = 3.872983346 + 3 Combine like terms: -3 + 3 = 0 0 + u = 3.872983346 + 3 u = 3.872983346 + 3 Combine like terms: 3.872983346 + 3 = 6.872983346 u = 6.872983346 Simplifying u = 6.872983346

Subproblem 2

u + -3 = -3.872983346 Simplifying u + -3 = -3.872983346 Reorder the terms: -3 + u = -3.872983346 Solving -3 + u = -3.872983346 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + u = -3.872983346 + 3 Combine like terms: -3 + 3 = 0 0 + u = -3.872983346 + 3 u = -3.872983346 + 3 Combine like terms: -3.872983346 + 3 = -0.872983346 u = -0.872983346 Simplifying u = -0.872983346

Solution

The solution to the problem is based on the solutions from the subproblems. u = {6.872983346, -0.872983346}

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