0.5k^2-2k=1

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Solution for 0.5k^2-2k=1 equation:


Simplifying
0.5k2 + -2k = 1

Reorder the terms:
-2k + 0.5k2 = 1

Solving
-2k + 0.5k2 = 1

Solving for variable 'k'.

Reorder the terms:
-1 + -2k + 0.5k2 = 1 + -1

Combine like terms: 1 + -1 = 0
-1 + -2k + 0.5k2 = 0

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

Divide each side by '0.5'.
-2 + -4k + k2 = 0

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + -4k + 2 + k2 = 0 + 2

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

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

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

The k term is -4k.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4k + 4 + k2 = 2 + 4

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

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

Factor a perfect square on the left side:
(k + -2)(k + -2) = 6

Calculate the square root of the right side: 2.449489743

Break this problem into two subproblems by setting 
(k + -2) equal to 2.449489743 and -2.449489743.

Subproblem 1

k + -2 = 2.449489743 Simplifying k + -2 = 2.449489743 Reorder the terms: -2 + k = 2.449489743 Solving -2 + k = 2.449489743 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + k = 2.449489743 + 2 Combine like terms: -2 + 2 = 0 0 + k = 2.449489743 + 2 k = 2.449489743 + 2 Combine like terms: 2.449489743 + 2 = 4.449489743 k = 4.449489743 Simplifying k = 4.449489743

Subproblem 2

k + -2 = -2.449489743 Simplifying k + -2 = -2.449489743 Reorder the terms: -2 + k = -2.449489743 Solving -2 + k = -2.449489743 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + k = -2.449489743 + 2 Combine like terms: -2 + 2 = 0 0 + k = -2.449489743 + 2 k = -2.449489743 + 2 Combine like terms: -2.449489743 + 2 = -0.449489743 k = -0.449489743 Simplifying k = -0.449489743

Solution

The solution to the problem is based on the solutions from the subproblems. k = {4.449489743, -0.449489743}

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