(-12-7n^2-8n)+(-6n+12n^2-13)=

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Solution for (-12-7n^2-8n)+(-6n+12n^2-13)= equation:


Simplifying
(-12 + -7n2 + -8n) + (-6n + 12n2 + -13) = 0

Reorder the terms:
(-12 + -8n + -7n2) + (-6n + 12n2 + -13) = 0

Remove parenthesis around (-12 + -8n + -7n2)
-12 + -8n + -7n2 + (-6n + 12n2 + -13) = 0

Reorder the terms:
-12 + -8n + -7n2 + (-13 + -6n + 12n2) = 0

Remove parenthesis around (-13 + -6n + 12n2)
-12 + -8n + -7n2 + -13 + -6n + 12n2 = 0

Reorder the terms:
-12 + -13 + -8n + -6n + -7n2 + 12n2 = 0

Combine like terms: -12 + -13 = -25
-25 + -8n + -6n + -7n2 + 12n2 = 0

Combine like terms: -8n + -6n = -14n
-25 + -14n + -7n2 + 12n2 = 0

Combine like terms: -7n2 + 12n2 = 5n2
-25 + -14n + 5n2 = 0

Solving
-25 + -14n + 5n2 = 0

Solving for variable 'n'.

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

Divide each side by '5'.
-5 + -2.8n + n2 = 0

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + -2.8n + 5 + n2 = 0 + 5

Reorder the terms:
-5 + 5 + -2.8n + n2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -2.8n + n2 = 0 + 5
-2.8n + n2 = 0 + 5

Combine like terms: 0 + 5 = 5
-2.8n + n2 = 5

The n term is -2.8n.  Take half its coefficient (-1.4).
Square it (1.96) and add it to both sides.

Add '1.96' to each side of the equation.
-2.8n + 1.96 + n2 = 5 + 1.96

Reorder the terms:
1.96 + -2.8n + n2 = 5 + 1.96

Combine like terms: 5 + 1.96 = 6.96
1.96 + -2.8n + n2 = 6.96

Factor a perfect square on the left side:
(n + -1.4)(n + -1.4) = 6.96

Calculate the square root of the right side: 2.638181192

Break this problem into two subproblems by setting 
(n + -1.4) equal to 2.638181192 and -2.638181192.

Subproblem 1

n + -1.4 = 2.638181192 Simplifying n + -1.4 = 2.638181192 Reorder the terms: -1.4 + n = 2.638181192 Solving -1.4 + n = 2.638181192 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '1.4' to each side of the equation. -1.4 + 1.4 + n = 2.638181192 + 1.4 Combine like terms: -1.4 + 1.4 = 0.0 0.0 + n = 2.638181192 + 1.4 n = 2.638181192 + 1.4 Combine like terms: 2.638181192 + 1.4 = 4.038181192 n = 4.038181192 Simplifying n = 4.038181192

Subproblem 2

n + -1.4 = -2.638181192 Simplifying n + -1.4 = -2.638181192 Reorder the terms: -1.4 + n = -2.638181192 Solving -1.4 + n = -2.638181192 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '1.4' to each side of the equation. -1.4 + 1.4 + n = -2.638181192 + 1.4 Combine like terms: -1.4 + 1.4 = 0.0 0.0 + n = -2.638181192 + 1.4 n = -2.638181192 + 1.4 Combine like terms: -2.638181192 + 1.4 = -1.238181192 n = -1.238181192 Simplifying n = -1.238181192

Solution

The solution to the problem is based on the solutions from the subproblems. n = {4.038181192, -1.238181192}

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