2n^2-10n-17=0

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Solution for 2n^2-10n-17=0 equation:


Simplifying
2n2 + -10n + -17 = 0

Reorder the terms:
-17 + -10n + 2n2 = 0

Solving
-17 + -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'.
-8.5 + -5n + n2 = 0

Move the constant term to the right:

Add '8.5' to each side of the equation.
-8.5 + -5n + 8.5 + n2 = 0 + 8.5

Reorder the terms:
-8.5 + 8.5 + -5n + n2 = 0 + 8.5

Combine like terms: -8.5 + 8.5 = 0.0
0.0 + -5n + n2 = 0 + 8.5
-5n + n2 = 0 + 8.5

Combine like terms: 0 + 8.5 = 8.5
-5n + n2 = 8.5

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 = 8.5 + 6.25

Reorder the terms:
6.25 + -5n + n2 = 8.5 + 6.25

Combine like terms: 8.5 + 6.25 = 14.75
6.25 + -5n + n2 = 14.75

Factor a perfect square on the left side:
(n + -2.5)(n + -2.5) = 14.75

Calculate the square root of the right side: 3.840572874

Break this problem into two subproblems by setting 
(n + -2.5) equal to 3.840572874 and -3.840572874.

Subproblem 1

n + -2.5 = 3.840572874 Simplifying n + -2.5 = 3.840572874 Reorder the terms: -2.5 + n = 3.840572874 Solving -2.5 + n = 3.840572874 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 = 3.840572874 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + n = 3.840572874 + 2.5 n = 3.840572874 + 2.5 Combine like terms: 3.840572874 + 2.5 = 6.340572874 n = 6.340572874 Simplifying n = 6.340572874

Subproblem 2

n + -2.5 = -3.840572874 Simplifying n + -2.5 = -3.840572874 Reorder the terms: -2.5 + n = -3.840572874 Solving -2.5 + n = -3.840572874 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 = -3.840572874 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + n = -3.840572874 + 2.5 n = -3.840572874 + 2.5 Combine like terms: -3.840572874 + 2.5 = -1.340572874 n = -1.340572874 Simplifying n = -1.340572874

Solution

The solution to the problem is based on the solutions from the subproblems. n = {6.340572874, -1.340572874}

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