2n^2-n-18=0

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Solution for 2n^2-n-18=0 equation:


Simplifying
2n2 + -1n + -18 = 0

Reorder the terms:
-18 + -1n + 2n2 = 0

Solving
-18 + -1n + 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'.
-9 + -0.5n + n2 = 0

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + -0.5n + 9 + n2 = 0 + 9

Reorder the terms:
-9 + 9 + -0.5n + n2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -0.5n + n2 = 0 + 9
-0.5n + n2 = 0 + 9

Combine like terms: 0 + 9 = 9
-0.5n + n2 = 9

The n term is -0.5n.  Take half its coefficient (-0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
-0.5n + 0.0625 + n2 = 9 + 0.0625

Reorder the terms:
0.0625 + -0.5n + n2 = 9 + 0.0625

Combine like terms: 9 + 0.0625 = 9.0625
0.0625 + -0.5n + n2 = 9.0625

Factor a perfect square on the left side:
(n + -0.25)(n + -0.25) = 9.0625

Calculate the square root of the right side: 3.010398645

Break this problem into two subproblems by setting 
(n + -0.25) equal to 3.010398645 and -3.010398645.

Subproblem 1

n + -0.25 = 3.010398645 Simplifying n + -0.25 = 3.010398645 Reorder the terms: -0.25 + n = 3.010398645 Solving -0.25 + n = 3.010398645 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + n = 3.010398645 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + n = 3.010398645 + 0.25 n = 3.010398645 + 0.25 Combine like terms: 3.010398645 + 0.25 = 3.260398645 n = 3.260398645 Simplifying n = 3.260398645

Subproblem 2

n + -0.25 = -3.010398645 Simplifying n + -0.25 = -3.010398645 Reorder the terms: -0.25 + n = -3.010398645 Solving -0.25 + n = -3.010398645 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + n = -3.010398645 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + n = -3.010398645 + 0.25 n = -3.010398645 + 0.25 Combine like terms: -3.010398645 + 0.25 = -2.760398645 n = -2.760398645 Simplifying n = -2.760398645

Solution

The solution to the problem is based on the solutions from the subproblems. n = {3.260398645, -2.760398645}

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