2k^2-k-6.25=0

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Solution for 2k^2-k-6.25=0 equation:


Simplifying
2k2 + -1k + -6.25 = 0

Reorder the terms:
-6.25 + -1k + 2k2 = 0

Solving
-6.25 + -1k + 2k2 = 0

Solving for variable 'k'.

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

Divide each side by '2'.
-3.125 + -0.5k + k2 = 0

Move the constant term to the right:

Add '3.125' to each side of the equation.
-3.125 + -0.5k + 3.125 + k2 = 0 + 3.125

Reorder the terms:
-3.125 + 3.125 + -0.5k + k2 = 0 + 3.125

Combine like terms: -3.125 + 3.125 = 0.000
0.000 + -0.5k + k2 = 0 + 3.125
-0.5k + k2 = 0 + 3.125

Combine like terms: 0 + 3.125 = 3.125
-0.5k + k2 = 3.125

The k term is -0.5k.  Take half its coefficient (-0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
-0.5k + 0.0625 + k2 = 3.125 + 0.0625

Reorder the terms:
0.0625 + -0.5k + k2 = 3.125 + 0.0625

Combine like terms: 3.125 + 0.0625 = 3.1875
0.0625 + -0.5k + k2 = 3.1875

Factor a perfect square on the left side:
(k + -0.25)(k + -0.25) = 3.1875

Calculate the square root of the right side: 1.785357107

Break this problem into two subproblems by setting 
(k + -0.25) equal to 1.785357107 and -1.785357107.

Subproblem 1

k + -0.25 = 1.785357107 Simplifying k + -0.25 = 1.785357107 Reorder the terms: -0.25 + k = 1.785357107 Solving -0.25 + k = 1.785357107 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + k = 1.785357107 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + k = 1.785357107 + 0.25 k = 1.785357107 + 0.25 Combine like terms: 1.785357107 + 0.25 = 2.035357107 k = 2.035357107 Simplifying k = 2.035357107

Subproblem 2

k + -0.25 = -1.785357107 Simplifying k + -0.25 = -1.785357107 Reorder the terms: -0.25 + k = -1.785357107 Solving -0.25 + k = -1.785357107 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + k = -1.785357107 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + k = -1.785357107 + 0.25 k = -1.785357107 + 0.25 Combine like terms: -1.785357107 + 0.25 = -1.535357107 k = -1.535357107 Simplifying k = -1.535357107

Solution

The solution to the problem is based on the solutions from the subproblems. k = {2.035357107, -1.535357107}

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