2k^2-6k-5=0

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Solution for 2k^2-6k-5=0 equation:


Simplifying
2k2 + -6k + -5 = 0

Reorder the terms:
-5 + -6k + 2k2 = 0

Solving
-5 + -6k + 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'.
-2.5 + -3k + k2 = 0

Move the constant term to the right:

Add '2.5' to each side of the equation.
-2.5 + -3k + 2.5 + k2 = 0 + 2.5

Reorder the terms:
-2.5 + 2.5 + -3k + k2 = 0 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + -3k + k2 = 0 + 2.5
-3k + k2 = 0 + 2.5

Combine like terms: 0 + 2.5 = 2.5
-3k + k2 = 2.5

The k term is -3k.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3k + 2.25 + k2 = 2.5 + 2.25

Reorder the terms:
2.25 + -3k + k2 = 2.5 + 2.25

Combine like terms: 2.5 + 2.25 = 4.75
2.25 + -3k + k2 = 4.75

Factor a perfect square on the left side:
(k + -1.5)(k + -1.5) = 4.75

Calculate the square root of the right side: 2.179449472

Break this problem into two subproblems by setting 
(k + -1.5) equal to 2.179449472 and -2.179449472.

Subproblem 1

k + -1.5 = 2.179449472 Simplifying k + -1.5 = 2.179449472 Reorder the terms: -1.5 + k = 2.179449472 Solving -1.5 + k = 2.179449472 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + k = 2.179449472 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + k = 2.179449472 + 1.5 k = 2.179449472 + 1.5 Combine like terms: 2.179449472 + 1.5 = 3.679449472 k = 3.679449472 Simplifying k = 3.679449472

Subproblem 2

k + -1.5 = -2.179449472 Simplifying k + -1.5 = -2.179449472 Reorder the terms: -1.5 + k = -2.179449472 Solving -1.5 + k = -2.179449472 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + k = -2.179449472 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + k = -2.179449472 + 1.5 k = -2.179449472 + 1.5 Combine like terms: -2.179449472 + 1.5 = -0.679449472 k = -0.679449472 Simplifying k = -0.679449472

Solution

The solution to the problem is based on the solutions from the subproblems. k = {3.679449472, -0.679449472}

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