5n^2-9n-2084=0

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Solution for 5n^2-9n-2084=0 equation:


Simplifying
5n2 + -9n + -2084 = 0

Reorder the terms:
-2084 + -9n + 5n2 = 0

Solving
-2084 + -9n + 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'.
-416.8 + -1.8n + n2 = 0

Move the constant term to the right:

Add '416.8' to each side of the equation.
-416.8 + -1.8n + 416.8 + n2 = 0 + 416.8

Reorder the terms:
-416.8 + 416.8 + -1.8n + n2 = 0 + 416.8

Combine like terms: -416.8 + 416.8 = 0.0
0.0 + -1.8n + n2 = 0 + 416.8
-1.8n + n2 = 0 + 416.8

Combine like terms: 0 + 416.8 = 416.8
-1.8n + n2 = 416.8

The n term is -1.8n.  Take half its coefficient (-0.9).
Square it (0.81) and add it to both sides.

Add '0.81' to each side of the equation.
-1.8n + 0.81 + n2 = 416.8 + 0.81

Reorder the terms:
0.81 + -1.8n + n2 = 416.8 + 0.81

Combine like terms: 416.8 + 0.81 = 417.61
0.81 + -1.8n + n2 = 417.61

Factor a perfect square on the left side:
(n + -0.9)(n + -0.9) = 417.61

Calculate the square root of the right side: 20.435508313

Break this problem into two subproblems by setting 
(n + -0.9) equal to 20.435508313 and -20.435508313.

Subproblem 1

n + -0.9 = 20.435508313 Simplifying n + -0.9 = 20.435508313 Reorder the terms: -0.9 + n = 20.435508313 Solving -0.9 + n = 20.435508313 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '0.9' to each side of the equation. -0.9 + 0.9 + n = 20.435508313 + 0.9 Combine like terms: -0.9 + 0.9 = 0.0 0.0 + n = 20.435508313 + 0.9 n = 20.435508313 + 0.9 Combine like terms: 20.435508313 + 0.9 = 21.335508313 n = 21.335508313 Simplifying n = 21.335508313

Subproblem 2

n + -0.9 = -20.435508313 Simplifying n + -0.9 = -20.435508313 Reorder the terms: -0.9 + n = -20.435508313 Solving -0.9 + n = -20.435508313 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '0.9' to each side of the equation. -0.9 + 0.9 + n = -20.435508313 + 0.9 Combine like terms: -0.9 + 0.9 = 0.0 0.0 + n = -20.435508313 + 0.9 n = -20.435508313 + 0.9 Combine like terms: -20.435508313 + 0.9 = -19.535508313 n = -19.535508313 Simplifying n = -19.535508313

Solution

The solution to the problem is based on the solutions from the subproblems. n = {21.335508313, -19.535508313}

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