9n^2-n-810=0

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Solution for 9n^2-n-810=0 equation:


Simplifying
9n2 + -1n + -810 = 0

Reorder the terms:
-810 + -1n + 9n2 = 0

Solving
-810 + -1n + 9n2 = 0

Solving for variable 'n'.

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

Divide each side by '9'.
-90 + -0.1111111111n + n2 = 0

Move the constant term to the right:

Add '90' to each side of the equation.
-90 + -0.1111111111n + 90 + n2 = 0 + 90

Reorder the terms:
-90 + 90 + -0.1111111111n + n2 = 0 + 90

Combine like terms: -90 + 90 = 0
0 + -0.1111111111n + n2 = 0 + 90
-0.1111111111n + n2 = 0 + 90

Combine like terms: 0 + 90 = 90
-0.1111111111n + n2 = 90

The n term is -0.1111111111n.  Take half its coefficient (-0.05555555555).
Square it (0.003086419752) and add it to both sides.

Add '0.003086419752' to each side of the equation.
-0.1111111111n + 0.003086419752 + n2 = 90 + 0.003086419752

Reorder the terms:
0.003086419752 + -0.1111111111n + n2 = 90 + 0.003086419752

Combine like terms: 90 + 0.003086419752 = 90.003086419752
0.003086419752 + -0.1111111111n + n2 = 90.003086419752

Factor a perfect square on the left side:
(n + -0.05555555555)(n + -0.05555555555) = 90.003086419752

Calculate the square root of the right side: 9.486995648

Break this problem into two subproblems by setting 
(n + -0.05555555555) equal to 9.486995648 and -9.486995648.

Subproblem 1

n + -0.05555555555 = 9.486995648 Simplifying n + -0.05555555555 = 9.486995648 Reorder the terms: -0.05555555555 + n = 9.486995648 Solving -0.05555555555 + n = 9.486995648 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '0.05555555555' to each side of the equation. -0.05555555555 + 0.05555555555 + n = 9.486995648 + 0.05555555555 Combine like terms: -0.05555555555 + 0.05555555555 = 0.00000000000 0.00000000000 + n = 9.486995648 + 0.05555555555 n = 9.486995648 + 0.05555555555 Combine like terms: 9.486995648 + 0.05555555555 = 9.54255120355 n = 9.54255120355 Simplifying n = 9.54255120355

Subproblem 2

n + -0.05555555555 = -9.486995648 Simplifying n + -0.05555555555 = -9.486995648 Reorder the terms: -0.05555555555 + n = -9.486995648 Solving -0.05555555555 + n = -9.486995648 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '0.05555555555' to each side of the equation. -0.05555555555 + 0.05555555555 + n = -9.486995648 + 0.05555555555 Combine like terms: -0.05555555555 + 0.05555555555 = 0.00000000000 0.00000000000 + n = -9.486995648 + 0.05555555555 n = -9.486995648 + 0.05555555555 Combine like terms: -9.486995648 + 0.05555555555 = -9.43144009245 n = -9.43144009245 Simplifying n = -9.43144009245

Solution

The solution to the problem is based on the solutions from the subproblems. n = {9.54255120355, -9.43144009245}

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