7k^2-12k-12=0

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Solution for 7k^2-12k-12=0 equation:


Simplifying
7k2 + -12k + -12 = 0

Reorder the terms:
-12 + -12k + 7k2 = 0

Solving
-12 + -12k + 7k2 = 0

Solving for variable 'k'.

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

Divide each side by '7'.
-1.714285714 + -1.714285714k + k2 = 0

Move the constant term to the right:

Add '1.714285714' to each side of the equation.
-1.714285714 + -1.714285714k + 1.714285714 + k2 = 0 + 1.714285714

Reorder the terms:
-1.714285714 + 1.714285714 + -1.714285714k + k2 = 0 + 1.714285714

Combine like terms: -1.714285714 + 1.714285714 = 0.000000000
0.000000000 + -1.714285714k + k2 = 0 + 1.714285714
-1.714285714k + k2 = 0 + 1.714285714

Combine like terms: 0 + 1.714285714 = 1.714285714
-1.714285714k + k2 = 1.714285714

The k term is -1.714285714k.  Take half its coefficient (-0.857142857).
Square it (0.7346938773) and add it to both sides.

Add '0.7346938773' to each side of the equation.
-1.714285714k + 0.7346938773 + k2 = 1.714285714 + 0.7346938773

Reorder the terms:
0.7346938773 + -1.714285714k + k2 = 1.714285714 + 0.7346938773

Combine like terms: 1.714285714 + 0.7346938773 = 2.4489795913
0.7346938773 + -1.714285714k + k2 = 2.4489795913

Factor a perfect square on the left side:
(k + -0.857142857)(k + -0.857142857) = 2.4489795913

Calculate the square root of the right side: 1.564921593

Break this problem into two subproblems by setting 
(k + -0.857142857) equal to 1.564921593 and -1.564921593.

Subproblem 1

k + -0.857142857 = 1.564921593 Simplifying k + -0.857142857 = 1.564921593 Reorder the terms: -0.857142857 + k = 1.564921593 Solving -0.857142857 + k = 1.564921593 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '0.857142857' to each side of the equation. -0.857142857 + 0.857142857 + k = 1.564921593 + 0.857142857 Combine like terms: -0.857142857 + 0.857142857 = 0.000000000 0.000000000 + k = 1.564921593 + 0.857142857 k = 1.564921593 + 0.857142857 Combine like terms: 1.564921593 + 0.857142857 = 2.42206445 k = 2.42206445 Simplifying k = 2.42206445

Subproblem 2

k + -0.857142857 = -1.564921593 Simplifying k + -0.857142857 = -1.564921593 Reorder the terms: -0.857142857 + k = -1.564921593 Solving -0.857142857 + k = -1.564921593 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '0.857142857' to each side of the equation. -0.857142857 + 0.857142857 + k = -1.564921593 + 0.857142857 Combine like terms: -0.857142857 + 0.857142857 = 0.000000000 0.000000000 + k = -1.564921593 + 0.857142857 k = -1.564921593 + 0.857142857 Combine like terms: -1.564921593 + 0.857142857 = -0.707778736 k = -0.707778736 Simplifying k = -0.707778736

Solution

The solution to the problem is based on the solutions from the subproblems. k = {2.42206445, -0.707778736}

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