-2k^2+4k=-2

Solution for -2k^2+4k=-2 equation:

Simplifying
-2k2 + 4k = -2

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

Solving
4k + -2k2 = -2

Solving for variable 'k'.

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

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

Factor out the Greatest Common Factor (GCF), '2'.
2(1 + 2k + -1k2) = 0

Ignore the factor 2.
Subproblem 1
Set the factor '(1 + 2k + -1k2)' equal to zero and attempt to solve:

Simplifying
1 + 2k + -1k2 = 0

Solving
1 + 2k + -1k2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-1 + -2k + k2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + -2k + 1 + k2 = 0 + 1

Reorder the terms:
-1 + 1 + -2k + k2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -2k + k2 = 0 + 1
-2k + k2 = 0 + 1

Combine like terms: 0 + 1 = 1
-2k + k2 = 1

The k term is -2k.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2k + 1 + k2 = 1 + 1

Reorder the terms:
1 + -2k + k2 = 1 + 1

Combine like terms: 1 + 1 = 2
1 + -2k + k2 = 2

Factor a perfect square on the left side:
(k + -1)(k + -1) = 2

Calculate the square root of the right side: 1.414213562

Break this problem into two subproblems by setting 
(k + -1) equal to 1.414213562 and -1.414213562.

Subproblem 1
k + -1 = 1.414213562

Simplifying
k + -1 = 1.414213562

Reorder the terms:
-1 + k = 1.414213562

Solving
-1 + k = 1.414213562

Solving for variable 'k'.

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

Add '1' to each side of the equation.
-1 + 1 + k = 1.414213562 + 1

Combine like terms: -1 + 1 = 0
0 + k = 1.414213562 + 1
k = 1.414213562 + 1

Combine like terms: 1.414213562 + 1 = 2.414213562
k = 2.414213562

Simplifying
k = 2.414213562

Subproblem 2
k + -1 = -1.414213562

Simplifying
k + -1 = -1.414213562

Reorder the terms:
-1 + k = -1.414213562

Solving
-1 + k = -1.414213562

Solving for variable 'k'.

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

Add '1' to each side of the equation.
-1 + 1 + k = -1.414213562 + 1

Combine like terms: -1 + 1 = 0
0 + k = -1.414213562 + 1
k = -1.414213562 + 1

Combine like terms: -1.414213562 + 1 = -0.414213562
k = -0.414213562

Simplifying
k = -0.414213562

Solution
The solution to the problem is based on the solutions
from the subproblems.
k = {2.414213562, -0.414213562}
Solution
k = {2.414213562, -0.414213562}