9(n+2)n+(n+4)=7

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Solution for 9(n+2)n+(n+4)=7 equation:


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

Reorder the terms:
9(2 + n) * n + (n + 4) = 7

Reorder the terms for easier multiplication:
9n(2 + n) + (n + 4) = 7
(2 * 9n + n * 9n) + (n + 4) = 7
(18n + 9n2) + (n + 4) = 7

Reorder the terms:
18n + 9n2 + (4 + n) = 7

Remove parenthesis around (4 + n)
18n + 9n2 + 4 + n = 7

Reorder the terms:
4 + 18n + n + 9n2 = 7

Combine like terms: 18n + n = 19n
4 + 19n + 9n2 = 7

Solving
4 + 19n + 9n2 = 7

Solving for variable 'n'.

Reorder the terms:
4 + -7 + 19n + 9n2 = 7 + -7

Combine like terms: 4 + -7 = -3
-3 + 19n + 9n2 = 7 + -7

Combine like terms: 7 + -7 = 0
-3 + 19n + 9n2 = 0

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

Divide each side by '9'.
-0.3333333333 + 2.111111111n + n2 = 0

Move the constant term to the right:

Add '0.3333333333' to each side of the equation.
-0.3333333333 + 2.111111111n + 0.3333333333 + n2 = 0 + 0.3333333333

Reorder the terms:
-0.3333333333 + 0.3333333333 + 2.111111111n + n2 = 0 + 0.3333333333

Combine like terms: -0.3333333333 + 0.3333333333 = 0.0000000000
0.0000000000 + 2.111111111n + n2 = 0 + 0.3333333333
2.111111111n + n2 = 0 + 0.3333333333

Combine like terms: 0 + 0.3333333333 = 0.3333333333
2.111111111n + n2 = 0.3333333333

The n term is 2.111111111n.  Take half its coefficient (1.055555556).
Square it (1.114197532) and add it to both sides.

Add '1.114197532' to each side of the equation.
2.111111111n + 1.114197532 + n2 = 0.3333333333 + 1.114197532

Reorder the terms:
1.114197532 + 2.111111111n + n2 = 0.3333333333 + 1.114197532

Combine like terms: 0.3333333333 + 1.114197532 = 1.4475308653
1.114197532 + 2.111111111n + n2 = 1.4475308653

Factor a perfect square on the left side:
(n + 1.055555556)(n + 1.055555556) = 1.4475308653

Calculate the square root of the right side: 1.203133769

Break this problem into two subproblems by setting 
(n + 1.055555556) equal to 1.203133769 and -1.203133769.

Subproblem 1

n + 1.055555556 = 1.203133769 Simplifying n + 1.055555556 = 1.203133769 Reorder the terms: 1.055555556 + n = 1.203133769 Solving 1.055555556 + n = 1.203133769 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-1.055555556' to each side of the equation. 1.055555556 + -1.055555556 + n = 1.203133769 + -1.055555556 Combine like terms: 1.055555556 + -1.055555556 = 0.000000000 0.000000000 + n = 1.203133769 + -1.055555556 n = 1.203133769 + -1.055555556 Combine like terms: 1.203133769 + -1.055555556 = 0.147578213 n = 0.147578213 Simplifying n = 0.147578213

Subproblem 2

n + 1.055555556 = -1.203133769 Simplifying n + 1.055555556 = -1.203133769 Reorder the terms: 1.055555556 + n = -1.203133769 Solving 1.055555556 + n = -1.203133769 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-1.055555556' to each side of the equation. 1.055555556 + -1.055555556 + n = -1.203133769 + -1.055555556 Combine like terms: 1.055555556 + -1.055555556 = 0.000000000 0.000000000 + n = -1.203133769 + -1.055555556 n = -1.203133769 + -1.055555556 Combine like terms: -1.203133769 + -1.055555556 = -2.258689325 n = -2.258689325 Simplifying n = -2.258689325

Solution

The solution to the problem is based on the solutions from the subproblems. n = {0.147578213, -2.258689325}

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