n^2-2n-1=38.5

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Solution for n^2-2n-1=38.5 equation:


Simplifying
n2 + -2n + -1 = 38.5

Reorder the terms:
-1 + -2n + n2 = 38.5

Solving
-1 + -2n + n2 = 38.5

Solving for variable 'n'.

Reorder the terms:
-1 + -38.5 + -2n + n2 = 38.5 + -38.5

Combine like terms: -1 + -38.5 = -39.5
-39.5 + -2n + n2 = 38.5 + -38.5

Combine like terms: 38.5 + -38.5 = 0.0
-39.5 + -2n + n2 = 0.0

Begin completing the square.

Move the constant term to the right:

Add '39.5' to each side of the equation.
-39.5 + -2n + 39.5 + n2 = 0.0 + 39.5

Reorder the terms:
-39.5 + 39.5 + -2n + n2 = 0.0 + 39.5

Combine like terms: -39.5 + 39.5 = 0.0
0.0 + -2n + n2 = 0.0 + 39.5
-2n + n2 = 0.0 + 39.5

Combine like terms: 0.0 + 39.5 = 39.5
-2n + n2 = 39.5

The n term is -2n.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2n + 1 + n2 = 39.5 + 1

Reorder the terms:
1 + -2n + n2 = 39.5 + 1

Combine like terms: 39.5 + 1 = 40.5
1 + -2n + n2 = 40.5

Factor a perfect square on the left side:
(n + -1)(n + -1) = 40.5

Calculate the square root of the right side: 6.363961031

Break this problem into two subproblems by setting 
(n + -1) equal to 6.363961031 and -6.363961031.

Subproblem 1

n + -1 = 6.363961031 Simplifying n + -1 = 6.363961031 Reorder the terms: -1 + n = 6.363961031 Solving -1 + n = 6.363961031 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + n = 6.363961031 + 1 Combine like terms: -1 + 1 = 0 0 + n = 6.363961031 + 1 n = 6.363961031 + 1 Combine like terms: 6.363961031 + 1 = 7.363961031 n = 7.363961031 Simplifying n = 7.363961031

Subproblem 2

n + -1 = -6.363961031 Simplifying n + -1 = -6.363961031 Reorder the terms: -1 + n = -6.363961031 Solving -1 + n = -6.363961031 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + n = -6.363961031 + 1 Combine like terms: -1 + 1 = 0 0 + n = -6.363961031 + 1 n = -6.363961031 + 1 Combine like terms: -6.363961031 + 1 = -5.363961031 n = -5.363961031 Simplifying n = -5.363961031

Solution

The solution to the problem is based on the solutions from the subproblems. n = {7.363961031, -5.363961031}

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