k^2-4k-2k-8=0

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Solution for k^2-4k-2k-8=0 equation: 


Simplifying
k2 + -4k + -2k + -8 = 0

Reorder the terms:
-8 + -4k + -2k + k2 = 0

Combine like terms: -4k + -2k = -6k
-8 + -6k + k2 = 0

Solving
-8 + -6k + k2 = 0

Solving for variable 'k'.

Begin completing the square.

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + -6k + 8 + k2 = 0 + 8

Reorder the terms:
-8 + 8 + -6k + k2 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + -6k + k2 = 0 + 8
-6k + k2 = 0 + 8

Combine like terms: 0 + 8 = 8
-6k + k2 = 8

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

Add '9' to each side of the equation.
-6k + 9 + k2 = 8 + 9

Reorder the terms:
9 + -6k + k2 = 8 + 9

Combine like terms: 8 + 9 = 17
9 + -6k + k2 = 17

Factor a perfect square on the left side:
(k + -3)(k + -3) = 17

Calculate the square root of the right side: 4.123105626

Break this problem into two subproblems by setting 
(k + -3) equal to 4.123105626 and -4.123105626.


Subproblem 1
k + -3 = 4.123105626

Simplifying
k + -3 = 4.123105626

Reorder the terms:
-3 + k = 4.123105626

Solving
-3 + k = 4.123105626

Solving for variable 'k'.

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

Add '3' to each side of the equation.
-3 + 3 + k = 4.123105626 + 3

Combine like terms: -3 + 3 = 0
0 + k = 4.123105626 + 3
k = 4.123105626 + 3

Combine like terms: 4.123105626 + 3 = 7.123105626
k = 7.123105626

Simplifying
k = 7.123105626


Subproblem 2
k + -3 = -4.123105626

Simplifying
k + -3 = -4.123105626

Reorder the terms:
-3 + k = -4.123105626

Solving
-3 + k = -4.123105626

Solving for variable 'k'.

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

Add '3' to each side of the equation.
-3 + 3 + k = -4.123105626 + 3

Combine like terms: -3 + 3 = 0
0 + k = -4.123105626 + 3
k = -4.123105626 + 3

Combine like terms: -4.123105626 + 3 = -1.123105626
k = -1.123105626

Simplifying
k = -1.123105626


Solution
The solution to the problem is based on the solutions
from the subproblems.
k = {7.123105626, -1.123105626}

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