12k^2-4=7k

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Solution for 12k^2-4=7k equation:


Simplifying
12k2 + -4 = 7k

Reorder the terms:
-4 + 12k2 = 7k

Solving
-4 + 12k2 = 7k

Solving for variable 'k'.

Reorder the terms:
-4 + -7k + 12k2 = 7k + -7k

Combine like terms: 7k + -7k = 0
-4 + -7k + 12k2 = 0

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

Divide each side by '12'.
-0.3333333333 + -0.5833333333k + k2 = 0

Move the constant term to the right:

Add '0.3333333333' to each side of the equation.
-0.3333333333 + -0.5833333333k + 0.3333333333 + k2 = 0 + 0.3333333333

Reorder the terms:
-0.3333333333 + 0.3333333333 + -0.5833333333k + k2 = 0 + 0.3333333333

Combine like terms: -0.3333333333 + 0.3333333333 = 0.0000000000
0.0000000000 + -0.5833333333k + k2 = 0 + 0.3333333333
-0.5833333333k + k2 = 0 + 0.3333333333

Combine like terms: 0 + 0.3333333333 = 0.3333333333
-0.5833333333k + k2 = 0.3333333333

The k term is -0.5833333333k.  Take half its coefficient (-0.2916666667).
Square it (0.08506944446) and add it to both sides.

Add '0.08506944446' to each side of the equation.
-0.5833333333k + 0.08506944446 + k2 = 0.3333333333 + 0.08506944446

Reorder the terms:
0.08506944446 + -0.5833333333k + k2 = 0.3333333333 + 0.08506944446

Combine like terms: 0.3333333333 + 0.08506944446 = 0.41840277776
0.08506944446 + -0.5833333333k + k2 = 0.41840277776

Factor a perfect square on the left side:
(k + -0.2916666667)(k + -0.2916666667) = 0.41840277776

Calculate the square root of the right side: 0.646840612

Break this problem into two subproblems by setting 
(k + -0.2916666667) equal to 0.646840612 and -0.646840612.

Subproblem 1

k + -0.2916666667 = 0.646840612 Simplifying k + -0.2916666667 = 0.646840612 Reorder the terms: -0.2916666667 + k = 0.646840612 Solving -0.2916666667 + k = 0.646840612 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '0.2916666667' to each side of the equation. -0.2916666667 + 0.2916666667 + k = 0.646840612 + 0.2916666667 Combine like terms: -0.2916666667 + 0.2916666667 = 0.0000000000 0.0000000000 + k = 0.646840612 + 0.2916666667 k = 0.646840612 + 0.2916666667 Combine like terms: 0.646840612 + 0.2916666667 = 0.9385072787 k = 0.9385072787 Simplifying k = 0.9385072787

Subproblem 2

k + -0.2916666667 = -0.646840612 Simplifying k + -0.2916666667 = -0.646840612 Reorder the terms: -0.2916666667 + k = -0.646840612 Solving -0.2916666667 + k = -0.646840612 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '0.2916666667' to each side of the equation. -0.2916666667 + 0.2916666667 + k = -0.646840612 + 0.2916666667 Combine like terms: -0.2916666667 + 0.2916666667 = 0.0000000000 0.0000000000 + k = -0.646840612 + 0.2916666667 k = -0.646840612 + 0.2916666667 Combine like terms: -0.646840612 + 0.2916666667 = -0.3551739453 k = -0.3551739453 Simplifying k = -0.3551739453

Solution

The solution to the problem is based on the solutions from the subproblems. k = {0.9385072787, -0.3551739453}

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