8n^2+3n-1=0

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Solution for 8n^2+3n-1=0 equation:


Simplifying
8n2 + 3n + -1 = 0

Reorder the terms:
-1 + 3n + 8n2 = 0

Solving
-1 + 3n + 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 + 0.375n + n2 = 0

Move the constant term to the right:

Add '0.125' to each side of the equation.
-0.125 + 0.375n + 0.125 + n2 = 0 + 0.125

Reorder the terms:
-0.125 + 0.125 + 0.375n + n2 = 0 + 0.125

Combine like terms: -0.125 + 0.125 = 0.000
0.000 + 0.375n + n2 = 0 + 0.125
0.375n + n2 = 0 + 0.125

Combine like terms: 0 + 0.125 = 0.125
0.375n + n2 = 0.125

The n term is 0.375n.  Take half its coefficient (0.1875).
Square it (0.03515625) and add it to both sides.

Add '0.03515625' to each side of the equation.
0.375n + 0.03515625 + n2 = 0.125 + 0.03515625

Reorder the terms:
0.03515625 + 0.375n + n2 = 0.125 + 0.03515625

Combine like terms: 0.125 + 0.03515625 = 0.16015625
0.03515625 + 0.375n + n2 = 0.16015625

Factor a perfect square on the left side:
(n + 0.1875)(n + 0.1875) = 0.16015625

Calculate the square root of the right side: 0.400195265

Break this problem into two subproblems by setting 
(n + 0.1875) equal to 0.400195265 and -0.400195265.

Subproblem 1

n + 0.1875 = 0.400195265 Simplifying n + 0.1875 = 0.400195265 Reorder the terms: 0.1875 + n = 0.400195265 Solving 0.1875 + n = 0.400195265 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-0.1875' to each side of the equation. 0.1875 + -0.1875 + n = 0.400195265 + -0.1875 Combine like terms: 0.1875 + -0.1875 = 0.0000 0.0000 + n = 0.400195265 + -0.1875 n = 0.400195265 + -0.1875 Combine like terms: 0.400195265 + -0.1875 = 0.212695265 n = 0.212695265 Simplifying n = 0.212695265

Subproblem 2

n + 0.1875 = -0.400195265 Simplifying n + 0.1875 = -0.400195265 Reorder the terms: 0.1875 + n = -0.400195265 Solving 0.1875 + n = -0.400195265 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-0.1875' to each side of the equation. 0.1875 + -0.1875 + n = -0.400195265 + -0.1875 Combine like terms: 0.1875 + -0.1875 = 0.0000 0.0000 + n = -0.400195265 + -0.1875 n = -0.400195265 + -0.1875 Combine like terms: -0.400195265 + -0.1875 = -0.587695265 n = -0.587695265 Simplifying n = -0.587695265

Solution

The solution to the problem is based on the solutions from the subproblems. n = {0.212695265, -0.587695265}

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