k^2-12k-11=0

Solution for k^2-12k-11=0 equation:

Simplifying
k2 + -12k + -11 = 0

Reorder the terms:
-11 + -12k + k2 = 0

Solving
-11 + -12k + k2 = 0

Solving for variable 'k'.

Begin completing the square.

Move the constant term to the right:

Add '11' to each side of the equation.
-11 + -12k + 11 + k2 = 0 + 11

Reorder the terms:
-11 + 11 + -12k + k2 = 0 + 11

Combine like terms: -11 + 11 = 0
0 + -12k + k2 = 0 + 11
-12k + k2 = 0 + 11

Combine like terms: 0 + 11 = 11
-12k + k2 = 11

The k term is -12k.  Take half its coefficient (-6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
-12k + 36 + k2 = 11 + 36

Reorder the terms:
36 + -12k + k2 = 11 + 36

Combine like terms: 11 + 36 = 47
36 + -12k + k2 = 47

Factor a perfect square on the left side:
(k + -6)(k + -6) = 47

Calculate the square root of the right side: 6.8556546

Break this problem into two subproblems by setting 
(k + -6) equal to 6.8556546 and -6.8556546.

Subproblem 1
k + -6 = 6.8556546

Simplifying
k + -6 = 6.8556546

Reorder the terms:
-6 + k = 6.8556546

Solving
-6 + k = 6.8556546

Solving for variable 'k'.

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

Add '6' to each side of the equation.
-6 + 6 + k = 6.8556546 + 6

Combine like terms: -6 + 6 = 0
0 + k = 6.8556546 + 6
k = 6.8556546 + 6

Combine like terms: 6.8556546 + 6 = 12.8556546
k = 12.8556546

Simplifying
k = 12.8556546

Subproblem 2
k + -6 = -6.8556546

Simplifying
k + -6 = -6.8556546

Reorder the terms:
-6 + k = -6.8556546

Solving
-6 + k = -6.8556546

Solving for variable 'k'.

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

Add '6' to each side of the equation.
-6 + 6 + k = -6.8556546 + 6

Combine like terms: -6 + 6 = 0
0 + k = -6.8556546 + 6
k = -6.8556546 + 6

Combine like terms: -6.8556546 + 6 = -0.8556546
k = -0.8556546

Simplifying
k = -0.8556546

Solution
The solution to the problem is based on the solutions
from the subproblems.
k = {12.8556546, -0.8556546}