2n^2+10n+11=0

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Solution for 2n^2+10n+11=0 equation:


Simplifying
2n2 + 10n + 11 = 0

Reorder the terms:
11 + 10n + 2n2 = 0

Solving
11 + 10n + 2n2 = 0

Solving for variable 'n'.

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

Divide each side by '2'.
5.5 + 5n + n2 = 0

Move the constant term to the right:

Add '-5.5' to each side of the equation.
5.5 + 5n + -5.5 + n2 = 0 + -5.5

Reorder the terms:
5.5 + -5.5 + 5n + n2 = 0 + -5.5

Combine like terms: 5.5 + -5.5 = 0.0
0.0 + 5n + n2 = 0 + -5.5
5n + n2 = 0 + -5.5

Combine like terms: 0 + -5.5 = -5.5
5n + n2 = -5.5

The n term is 5n.  Take half its coefficient (2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
5n + 6.25 + n2 = -5.5 + 6.25

Reorder the terms:
6.25 + 5n + n2 = -5.5 + 6.25

Combine like terms: -5.5 + 6.25 = 0.75
6.25 + 5n + n2 = 0.75

Factor a perfect square on the left side:
(n + 2.5)(n + 2.5) = 0.75

Calculate the square root of the right side: 0.866025404

Break this problem into two subproblems by setting 
(n + 2.5) equal to 0.866025404 and -0.866025404.

Subproblem 1

n + 2.5 = 0.866025404 Simplifying n + 2.5 = 0.866025404 Reorder the terms: 2.5 + n = 0.866025404 Solving 2.5 + n = 0.866025404 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + n = 0.866025404 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + n = 0.866025404 + -2.5 n = 0.866025404 + -2.5 Combine like terms: 0.866025404 + -2.5 = -1.633974596 n = -1.633974596 Simplifying n = -1.633974596

Subproblem 2

n + 2.5 = -0.866025404 Simplifying n + 2.5 = -0.866025404 Reorder the terms: 2.5 + n = -0.866025404 Solving 2.5 + n = -0.866025404 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + n = -0.866025404 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + n = -0.866025404 + -2.5 n = -0.866025404 + -2.5 Combine like terms: -0.866025404 + -2.5 = -3.366025404 n = -3.366025404 Simplifying n = -3.366025404

Solution

The solution to the problem is based on the solutions from the subproblems. n = {-1.633974596, -3.366025404}

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