10n^2-65n-36=0

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Solution for 10n^2-65n-36=0 equation:


Simplifying
10n2 + -65n + -36 = 0

Reorder the terms:
-36 + -65n + 10n2 = 0

Solving
-36 + -65n + 10n2 = 0

Solving for variable 'n'.

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

Divide each side by '10'.
-3.6 + -6.5n + n2 = 0

Move the constant term to the right:

Add '3.6' to each side of the equation.
-3.6 + -6.5n + 3.6 + n2 = 0 + 3.6

Reorder the terms:
-3.6 + 3.6 + -6.5n + n2 = 0 + 3.6

Combine like terms: -3.6 + 3.6 = 0.0
0.0 + -6.5n + n2 = 0 + 3.6
-6.5n + n2 = 0 + 3.6

Combine like terms: 0 + 3.6 = 3.6
-6.5n + n2 = 3.6

The n term is -6.5n.  Take half its coefficient (-3.25).
Square it (10.5625) and add it to both sides.

Add '10.5625' to each side of the equation.
-6.5n + 10.5625 + n2 = 3.6 + 10.5625

Reorder the terms:
10.5625 + -6.5n + n2 = 3.6 + 10.5625

Combine like terms: 3.6 + 10.5625 = 14.1625
10.5625 + -6.5n + n2 = 14.1625

Factor a perfect square on the left side:
(n + -3.25)(n + -3.25) = 14.1625

Calculate the square root of the right side: 3.763309714

Break this problem into two subproblems by setting 
(n + -3.25) equal to 3.763309714 and -3.763309714.

Subproblem 1

n + -3.25 = 3.763309714 Simplifying n + -3.25 = 3.763309714 Reorder the terms: -3.25 + n = 3.763309714 Solving -3.25 + n = 3.763309714 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '3.25' to each side of the equation. -3.25 + 3.25 + n = 3.763309714 + 3.25 Combine like terms: -3.25 + 3.25 = 0.00 0.00 + n = 3.763309714 + 3.25 n = 3.763309714 + 3.25 Combine like terms: 3.763309714 + 3.25 = 7.013309714 n = 7.013309714 Simplifying n = 7.013309714

Subproblem 2

n + -3.25 = -3.763309714 Simplifying n + -3.25 = -3.763309714 Reorder the terms: -3.25 + n = -3.763309714 Solving -3.25 + n = -3.763309714 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '3.25' to each side of the equation. -3.25 + 3.25 + n = -3.763309714 + 3.25 Combine like terms: -3.25 + 3.25 = 0.00 0.00 + n = -3.763309714 + 3.25 n = -3.763309714 + 3.25 Combine like terms: -3.763309714 + 3.25 = -0.513309714 n = -0.513309714 Simplifying n = -0.513309714

Solution

The solution to the problem is based on the solutions from the subproblems. n = {7.013309714, -0.513309714}

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