2k(k+13)=13

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Solution for 2k(k+13)=13 equation:


Simplifying
2k(k + 13) = 13

Reorder the terms:
2k(13 + k) = 13
(13 * 2k + k * 2k) = 13
(26k + 2k2) = 13

Solving
26k + 2k2 = 13

Solving for variable 'k'.

Reorder the terms:
-13 + 26k + 2k2 = 13 + -13

Combine like terms: 13 + -13 = 0
-13 + 26k + 2k2 = 0

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

Divide each side by '2'.
-6.5 + 13k + k2 = 0

Move the constant term to the right:

Add '6.5' to each side of the equation.
-6.5 + 13k + 6.5 + k2 = 0 + 6.5

Reorder the terms:
-6.5 + 6.5 + 13k + k2 = 0 + 6.5

Combine like terms: -6.5 + 6.5 = 0.0
0.0 + 13k + k2 = 0 + 6.5
13k + k2 = 0 + 6.5

Combine like terms: 0 + 6.5 = 6.5
13k + k2 = 6.5

The k term is 13k.  Take half its coefficient (6.5).
Square it (42.25) and add it to both sides.

Add '42.25' to each side of the equation.
13k + 42.25 + k2 = 6.5 + 42.25

Reorder the terms:
42.25 + 13k + k2 = 6.5 + 42.25

Combine like terms: 6.5 + 42.25 = 48.75
42.25 + 13k + k2 = 48.75

Factor a perfect square on the left side:
(k + 6.5)(k + 6.5) = 48.75

Calculate the square root of the right side: 6.982120022

Break this problem into two subproblems by setting 
(k + 6.5) equal to 6.982120022 and -6.982120022.

Subproblem 1

k + 6.5 = 6.982120022 Simplifying k + 6.5 = 6.982120022 Reorder the terms: 6.5 + k = 6.982120022 Solving 6.5 + k = 6.982120022 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-6.5' to each side of the equation. 6.5 + -6.5 + k = 6.982120022 + -6.5 Combine like terms: 6.5 + -6.5 = 0.0 0.0 + k = 6.982120022 + -6.5 k = 6.982120022 + -6.5 Combine like terms: 6.982120022 + -6.5 = 0.482120022 k = 0.482120022 Simplifying k = 0.482120022

Subproblem 2

k + 6.5 = -6.982120022 Simplifying k + 6.5 = -6.982120022 Reorder the terms: 6.5 + k = -6.982120022 Solving 6.5 + k = -6.982120022 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-6.5' to each side of the equation. 6.5 + -6.5 + k = -6.982120022 + -6.5 Combine like terms: 6.5 + -6.5 = 0.0 0.0 + k = -6.982120022 + -6.5 k = -6.982120022 + -6.5 Combine like terms: -6.982120022 + -6.5 = -13.482120022 k = -13.482120022 Simplifying k = -13.482120022

Solution

The solution to the problem is based on the solutions from the subproblems. k = {0.482120022, -13.482120022}

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