3+8n=3n(2n-1)

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Solution for 3+8n=3n(2n-1) equation:


Simplifying
3 + 8n = 3n(2n + -1)

Reorder the terms:
3 + 8n = 3n(-1 + 2n)
3 + 8n = (-1 * 3n + 2n * 3n)
3 + 8n = (-3n + 6n2)

Solving
3 + 8n = -3n + 6n2

Solving for variable 'n'.

Combine like terms: 8n + 3n = 11n
3 + 11n + -6n2 = -3n + 6n2 + 3n + -6n2

Reorder the terms:
3 + 11n + -6n2 = -3n + 3n + 6n2 + -6n2

Combine like terms: -3n + 3n = 0
3 + 11n + -6n2 = 0 + 6n2 + -6n2
3 + 11n + -6n2 = 6n2 + -6n2

Combine like terms: 6n2 + -6n2 = 0
3 + 11n + -6n2 = 0

Begin completing the square.  Divide all terms by
-6 the coefficient of the squared term: 

Divide each side by '-6'.
-0.5 + -1.833333333n + n2 = 0

Move the constant term to the right:

Add '0.5' to each side of the equation.
-0.5 + -1.833333333n + 0.5 + n2 = 0 + 0.5

Reorder the terms:
-0.5 + 0.5 + -1.833333333n + n2 = 0 + 0.5

Combine like terms: -0.5 + 0.5 = 0.0
0.0 + -1.833333333n + n2 = 0 + 0.5
-1.833333333n + n2 = 0 + 0.5

Combine like terms: 0 + 0.5 = 0.5
-1.833333333n + n2 = 0.5

The n term is -1.833333333n.  Take half its coefficient (-0.9166666665).
Square it (0.8402777775) and add it to both sides.

Add '0.8402777775' to each side of the equation.
-1.833333333n + 0.8402777775 + n2 = 0.5 + 0.8402777775

Reorder the terms:
0.8402777775 + -1.833333333n + n2 = 0.5 + 0.8402777775

Combine like terms: 0.5 + 0.8402777775 = 1.3402777775
0.8402777775 + -1.833333333n + n2 = 1.3402777775

Factor a perfect square on the left side:
(n + -0.9166666665)(n + -0.9166666665) = 1.3402777775

Calculate the square root of the right side: 1.157703666

Break this problem into two subproblems by setting 
(n + -0.9166666665) equal to 1.157703666 and -1.157703666.

Subproblem 1

n + -0.9166666665 = 1.157703666 Simplifying n + -0.9166666665 = 1.157703666 Reorder the terms: -0.9166666665 + n = 1.157703666 Solving -0.9166666665 + n = 1.157703666 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '0.9166666665' to each side of the equation. -0.9166666665 + 0.9166666665 + n = 1.157703666 + 0.9166666665 Combine like terms: -0.9166666665 + 0.9166666665 = 0.0000000000 0.0000000000 + n = 1.157703666 + 0.9166666665 n = 1.157703666 + 0.9166666665 Combine like terms: 1.157703666 + 0.9166666665 = 2.0743703325 n = 2.0743703325 Simplifying n = 2.0743703325

Subproblem 2

n + -0.9166666665 = -1.157703666 Simplifying n + -0.9166666665 = -1.157703666 Reorder the terms: -0.9166666665 + n = -1.157703666 Solving -0.9166666665 + n = -1.157703666 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '0.9166666665' to each side of the equation. -0.9166666665 + 0.9166666665 + n = -1.157703666 + 0.9166666665 Combine like terms: -0.9166666665 + 0.9166666665 = 0.0000000000 0.0000000000 + n = -1.157703666 + 0.9166666665 n = -1.157703666 + 0.9166666665 Combine like terms: -1.157703666 + 0.9166666665 = -0.2410369995 n = -0.2410369995 Simplifying n = -0.2410369995

Solution

The solution to the problem is based on the solutions from the subproblems. n = {2.0743703325, -0.2410369995}

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