55=7(n+4)2n

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Solution for 55=7(n+4)2n equation:


Simplifying
55 = 7(n + 4) * 2n

Reorder the terms:
55 = 7(4 + n) * 2n

Reorder the terms for easier multiplication:
55 = 7 * 2n(4 + n)

Multiply 7 * 2
55 = 14n(4 + n)
55 = (4 * 14n + n * 14n)
55 = (56n + 14n2)

Solving
55 = 56n + 14n2

Solving for variable 'n'.

Reorder the terms:
55 + -56n + -14n2 = 56n + -56n + 14n2 + -14n2

Combine like terms: 56n + -56n = 0
55 + -56n + -14n2 = 0 + 14n2 + -14n2
55 + -56n + -14n2 = 14n2 + -14n2

Combine like terms: 14n2 + -14n2 = 0
55 + -56n + -14n2 = 0

Begin completing the square.  Divide all terms by
-14 the coefficient of the squared term: 

Divide each side by '-14'.
-3.928571429 + 4n + n2 = 0

Move the constant term to the right:

Add '3.928571429' to each side of the equation.
-3.928571429 + 4n + 3.928571429 + n2 = 0 + 3.928571429

Reorder the terms:
-3.928571429 + 3.928571429 + 4n + n2 = 0 + 3.928571429

Combine like terms: -3.928571429 + 3.928571429 = 0.000000000
0.000000000 + 4n + n2 = 0 + 3.928571429
4n + n2 = 0 + 3.928571429

Combine like terms: 0 + 3.928571429 = 3.928571429
4n + n2 = 3.928571429

The n term is 4n.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4n + 4 + n2 = 3.928571429 + 4

Reorder the terms:
4 + 4n + n2 = 3.928571429 + 4

Combine like terms: 3.928571429 + 4 = 7.928571429
4 + 4n + n2 = 7.928571429

Factor a perfect square on the left side:
(n + 2)(n + 2) = 7.928571429

Calculate the square root of the right side: 2.815771906

Break this problem into two subproblems by setting 
(n + 2) equal to 2.815771906 and -2.815771906.

Subproblem 1

n + 2 = 2.815771906 Simplifying n + 2 = 2.815771906 Reorder the terms: 2 + n = 2.815771906 Solving 2 + n = 2.815771906 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + n = 2.815771906 + -2 Combine like terms: 2 + -2 = 0 0 + n = 2.815771906 + -2 n = 2.815771906 + -2 Combine like terms: 2.815771906 + -2 = 0.815771906 n = 0.815771906 Simplifying n = 0.815771906

Subproblem 2

n + 2 = -2.815771906 Simplifying n + 2 = -2.815771906 Reorder the terms: 2 + n = -2.815771906 Solving 2 + n = -2.815771906 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + n = -2.815771906 + -2 Combine like terms: 2 + -2 = 0 0 + n = -2.815771906 + -2 n = -2.815771906 + -2 Combine like terms: -2.815771906 + -2 = -4.815771906 n = -4.815771906 Simplifying n = -4.815771906

Solution

The solution to the problem is based on the solutions from the subproblems. n = {0.815771906, -4.815771906}

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