12k^2+15=16k+20

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Solution for 12k^2+15=16k+20 equation:


Simplifying
12k2 + 15 = 16k + 20

Reorder the terms:
15 + 12k2 = 16k + 20

Reorder the terms:
15 + 12k2 = 20 + 16k

Solving
15 + 12k2 = 20 + 16k

Solving for variable 'k'.

Reorder the terms:
15 + -20 + -16k + 12k2 = 20 + 16k + -20 + -16k

Combine like terms: 15 + -20 = -5
-5 + -16k + 12k2 = 20 + 16k + -20 + -16k

Reorder the terms:
-5 + -16k + 12k2 = 20 + -20 + 16k + -16k

Combine like terms: 20 + -20 = 0
-5 + -16k + 12k2 = 0 + 16k + -16k
-5 + -16k + 12k2 = 16k + -16k

Combine like terms: 16k + -16k = 0
-5 + -16k + 12k2 = 0

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

Divide each side by '12'.
-0.4166666667 + -1.333333333k + k2 = 0

Move the constant term to the right:

Add '0.4166666667' to each side of the equation.
-0.4166666667 + -1.333333333k + 0.4166666667 + k2 = 0 + 0.4166666667

Reorder the terms:
-0.4166666667 + 0.4166666667 + -1.333333333k + k2 = 0 + 0.4166666667

Combine like terms: -0.4166666667 + 0.4166666667 = 0.0000000000
0.0000000000 + -1.333333333k + k2 = 0 + 0.4166666667
-1.333333333k + k2 = 0 + 0.4166666667

Combine like terms: 0 + 0.4166666667 = 0.4166666667
-1.333333333k + k2 = 0.4166666667

The k term is -1.333333333k.  Take half its coefficient (-0.6666666665).
Square it (0.4444444442) and add it to both sides.

Add '0.4444444442' to each side of the equation.
-1.333333333k + 0.4444444442 + k2 = 0.4166666667 + 0.4444444442

Reorder the terms:
0.4444444442 + -1.333333333k + k2 = 0.4166666667 + 0.4444444442

Combine like terms: 0.4166666667 + 0.4444444442 = 0.8611111109
0.4444444442 + -1.333333333k + k2 = 0.8611111109

Factor a perfect square on the left side:
(k + -0.6666666665)(k + -0.6666666665) = 0.8611111109

Calculate the square root of the right side: 0.927960727

Break this problem into two subproblems by setting 
(k + -0.6666666665) equal to 0.927960727 and -0.927960727.

Subproblem 1

k + -0.6666666665 = 0.927960727 Simplifying k + -0.6666666665 = 0.927960727 Reorder the terms: -0.6666666665 + k = 0.927960727 Solving -0.6666666665 + k = 0.927960727 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '0.6666666665' to each side of the equation. -0.6666666665 + 0.6666666665 + k = 0.927960727 + 0.6666666665 Combine like terms: -0.6666666665 + 0.6666666665 = 0.0000000000 0.0000000000 + k = 0.927960727 + 0.6666666665 k = 0.927960727 + 0.6666666665 Combine like terms: 0.927960727 + 0.6666666665 = 1.5946273935 k = 1.5946273935 Simplifying k = 1.5946273935

Subproblem 2

k + -0.6666666665 = -0.927960727 Simplifying k + -0.6666666665 = -0.927960727 Reorder the terms: -0.6666666665 + k = -0.927960727 Solving -0.6666666665 + k = -0.927960727 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '0.6666666665' to each side of the equation. -0.6666666665 + 0.6666666665 + k = -0.927960727 + 0.6666666665 Combine like terms: -0.6666666665 + 0.6666666665 = 0.0000000000 0.0000000000 + k = -0.927960727 + 0.6666666665 k = -0.927960727 + 0.6666666665 Combine like terms: -0.927960727 + 0.6666666665 = -0.2612940605 k = -0.2612940605 Simplifying k = -0.2612940605

Solution

The solution to the problem is based on the solutions from the subproblems. k = {1.5946273935, -0.2612940605}

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