k^2-14k-6=-8

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Solution for k^2-14k-6=-8 equation:


Simplifying
k2 + -14k + -6 = -8

Reorder the terms:
-6 + -14k + k2 = -8

Solving
-6 + -14k + k2 = -8

Solving for variable 'k'.

Reorder the terms:
-6 + 8 + -14k + k2 = -8 + 8

Combine like terms: -6 + 8 = 2
2 + -14k + k2 = -8 + 8

Combine like terms: -8 + 8 = 0
2 + -14k + k2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-2' to each side of the equation.
2 + -14k + -2 + k2 = 0 + -2

Reorder the terms:
2 + -2 + -14k + k2 = 0 + -2

Combine like terms: 2 + -2 = 0
0 + -14k + k2 = 0 + -2
-14k + k2 = 0 + -2

Combine like terms: 0 + -2 = -2
-14k + k2 = -2

The k term is -14k.  Take half its coefficient (-7).
Square it (49) and add it to both sides.

Add '49' to each side of the equation.
-14k + 49 + k2 = -2 + 49

Reorder the terms:
49 + -14k + k2 = -2 + 49

Combine like terms: -2 + 49 = 47
49 + -14k + k2 = 47

Factor a perfect square on the left side:
(k + -7)(k + -7) = 47

Calculate the square root of the right side: 6.8556546

Break this problem into two subproblems by setting 
(k + -7) equal to 6.8556546 and -6.8556546.

Subproblem 1

k + -7 = 6.8556546 Simplifying k + -7 = 6.8556546 Reorder the terms: -7 + k = 6.8556546 Solving -7 + k = 6.8556546 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + k = 6.8556546 + 7 Combine like terms: -7 + 7 = 0 0 + k = 6.8556546 + 7 k = 6.8556546 + 7 Combine like terms: 6.8556546 + 7 = 13.8556546 k = 13.8556546 Simplifying k = 13.8556546

Subproblem 2

k + -7 = -6.8556546 Simplifying k + -7 = -6.8556546 Reorder the terms: -7 + k = -6.8556546 Solving -7 + k = -6.8556546 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + k = -6.8556546 + 7 Combine like terms: -7 + 7 = 0 0 + k = -6.8556546 + 7 k = -6.8556546 + 7 Combine like terms: -6.8556546 + 7 = 0.1443454 k = 0.1443454 Simplifying k = 0.1443454

Solution

The solution to the problem is based on the solutions from the subproblems. k = {13.8556546, 0.1443454}

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