8n^2-n-1=

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Solution for 8n^2-n-1= equation:


Simplifying
8n2 + -1n + -1 = 0

Reorder the terms:
-1 + -1n + 8n2 = 0

Solving
-1 + -1n + 8n2 = 0

Solving for variable 'n'.

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

Divide each side by '8'.
-0.125 + -0.125n + n2 = 0

Move the constant term to the right:

Add '0.125' to each side of the equation.
-0.125 + -0.125n + 0.125 + n2 = 0 + 0.125

Reorder the terms:
-0.125 + 0.125 + -0.125n + n2 = 0 + 0.125

Combine like terms: -0.125 + 0.125 = 0.000
0.000 + -0.125n + n2 = 0 + 0.125
-0.125n + n2 = 0 + 0.125

Combine like terms: 0 + 0.125 = 0.125
-0.125n + n2 = 0.125

The n term is -0.125n.  Take half its coefficient (-0.0625).
Square it (0.00390625) and add it to both sides.

Add '0.00390625' to each side of the equation.
-0.125n + 0.00390625 + n2 = 0.125 + 0.00390625

Reorder the terms:
0.00390625 + -0.125n + n2 = 0.125 + 0.00390625

Combine like terms: 0.125 + 0.00390625 = 0.12890625
0.00390625 + -0.125n + n2 = 0.12890625

Factor a perfect square on the left side:
(n + -0.0625)(n + -0.0625) = 0.12890625

Calculate the square root of the right side: 0.359035165

Break this problem into two subproblems by setting 
(n + -0.0625) equal to 0.359035165 and -0.359035165.

Subproblem 1

n + -0.0625 = 0.359035165 Simplifying n + -0.0625 = 0.359035165 Reorder the terms: -0.0625 + n = 0.359035165 Solving -0.0625 + n = 0.359035165 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '0.0625' to each side of the equation. -0.0625 + 0.0625 + n = 0.359035165 + 0.0625 Combine like terms: -0.0625 + 0.0625 = 0.0000 0.0000 + n = 0.359035165 + 0.0625 n = 0.359035165 + 0.0625 Combine like terms: 0.359035165 + 0.0625 = 0.421535165 n = 0.421535165 Simplifying n = 0.421535165

Subproblem 2

n + -0.0625 = -0.359035165 Simplifying n + -0.0625 = -0.359035165 Reorder the terms: -0.0625 + n = -0.359035165 Solving -0.0625 + n = -0.359035165 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '0.0625' to each side of the equation. -0.0625 + 0.0625 + n = -0.359035165 + 0.0625 Combine like terms: -0.0625 + 0.0625 = 0.0000 0.0000 + n = -0.359035165 + 0.0625 n = -0.359035165 + 0.0625 Combine like terms: -0.359035165 + 0.0625 = -0.296535165 n = -0.296535165 Simplifying n = -0.296535165

Solution

The solution to the problem is based on the solutions from the subproblems. n = {0.421535165, -0.296535165}

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