2n^2+20n-191=0

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Solution for 2n^2+20n-191=0 equation:


Simplifying
2n2 + 20n + -191 = 0

Reorder the terms:
-191 + 20n + 2n2 = 0

Solving
-191 + 20n + 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'.
-95.5 + 10n + n2 = 0

Move the constant term to the right:

Add '95.5' to each side of the equation.
-95.5 + 10n + 95.5 + n2 = 0 + 95.5

Reorder the terms:
-95.5 + 95.5 + 10n + n2 = 0 + 95.5

Combine like terms: -95.5 + 95.5 = 0.0
0.0 + 10n + n2 = 0 + 95.5
10n + n2 = 0 + 95.5

Combine like terms: 0 + 95.5 = 95.5
10n + n2 = 95.5

The n term is 10n.  Take half its coefficient (5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
10n + 25 + n2 = 95.5 + 25

Reorder the terms:
25 + 10n + n2 = 95.5 + 25

Combine like terms: 95.5 + 25 = 120.5
25 + 10n + n2 = 120.5

Factor a perfect square on the left side:
(n + 5)(n + 5) = 120.5

Calculate the square root of the right side: 10.9772492

Break this problem into two subproblems by setting 
(n + 5) equal to 10.9772492 and -10.9772492.

Subproblem 1

n + 5 = 10.9772492 Simplifying n + 5 = 10.9772492 Reorder the terms: 5 + n = 10.9772492 Solving 5 + n = 10.9772492 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + n = 10.9772492 + -5 Combine like terms: 5 + -5 = 0 0 + n = 10.9772492 + -5 n = 10.9772492 + -5 Combine like terms: 10.9772492 + -5 = 5.9772492 n = 5.9772492 Simplifying n = 5.9772492

Subproblem 2

n + 5 = -10.9772492 Simplifying n + 5 = -10.9772492 Reorder the terms: 5 + n = -10.9772492 Solving 5 + n = -10.9772492 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + n = -10.9772492 + -5 Combine like terms: 5 + -5 = 0 0 + n = -10.9772492 + -5 n = -10.9772492 + -5 Combine like terms: -10.9772492 + -5 = -15.9772492 n = -15.9772492 Simplifying n = -15.9772492

Solution

The solution to the problem is based on the solutions from the subproblems. n = {5.9772492, -15.9772492}

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