5n^2+11n-2000=0

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Solution for 5n^2+11n-2000=0 equation:


Simplifying
5n2 + 11n + -2000 = 0

Reorder the terms:
-2000 + 11n + 5n2 = 0

Solving
-2000 + 11n + 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'.
-400 + 2.2n + n2 = 0

Move the constant term to the right:

Add '400' to each side of the equation.
-400 + 2.2n + 400 + n2 = 0 + 400

Reorder the terms:
-400 + 400 + 2.2n + n2 = 0 + 400

Combine like terms: -400 + 400 = 0
0 + 2.2n + n2 = 0 + 400
2.2n + n2 = 0 + 400

Combine like terms: 0 + 400 = 400
2.2n + n2 = 400

The n term is 2.2n.  Take half its coefficient (1.1).
Square it (1.21) and add it to both sides.

Add '1.21' to each side of the equation.
2.2n + 1.21 + n2 = 400 + 1.21

Reorder the terms:
1.21 + 2.2n + n2 = 400 + 1.21

Combine like terms: 400 + 1.21 = 401.21
1.21 + 2.2n + n2 = 401.21

Factor a perfect square on the left side:
(n + 1.1)(n + 1.1) = 401.21

Calculate the square root of the right side: 20.030227158

Break this problem into two subproblems by setting 
(n + 1.1) equal to 20.030227158 and -20.030227158.

Subproblem 1

n + 1.1 = 20.030227158 Simplifying n + 1.1 = 20.030227158 Reorder the terms: 1.1 + n = 20.030227158 Solving 1.1 + n = 20.030227158 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-1.1' to each side of the equation. 1.1 + -1.1 + n = 20.030227158 + -1.1 Combine like terms: 1.1 + -1.1 = 0.0 0.0 + n = 20.030227158 + -1.1 n = 20.030227158 + -1.1 Combine like terms: 20.030227158 + -1.1 = 18.930227158 n = 18.930227158 Simplifying n = 18.930227158

Subproblem 2

n + 1.1 = -20.030227158 Simplifying n + 1.1 = -20.030227158 Reorder the terms: 1.1 + n = -20.030227158 Solving 1.1 + n = -20.030227158 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-1.1' to each side of the equation. 1.1 + -1.1 + n = -20.030227158 + -1.1 Combine like terms: 1.1 + -1.1 = 0.0 0.0 + n = -20.030227158 + -1.1 n = -20.030227158 + -1.1 Combine like terms: -20.030227158 + -1.1 = -21.130227158 n = -21.130227158 Simplifying n = -21.130227158

Solution

The solution to the problem is based on the solutions from the subproblems. n = {18.930227158, -21.130227158}

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