2n^2-5n+1=5

Solution for 2n^2-5n+1=5 equation:

Simplifying
2n2 + -5n + 1 = 5

Reorder the terms:
1 + -5n + 2n2 = 5

Solving
1 + -5n + 2n2 = 5

Solving for variable 'n'.

Reorder the terms:
1 + -5 + -5n + 2n2 = 5 + -5

Combine like terms: 1 + -5 = -4
-4 + -5n + 2n2 = 5 + -5

Combine like terms: 5 + -5 = 0
-4 + -5n + 2n2 = 0

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

Divide each side by '2'.
-2 + -2.5n + n2 = 0

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + -2.5n + 2 + n2 = 0 + 2

Reorder the terms:
-2 + 2 + -2.5n + n2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + -2.5n + n2 = 0 + 2
-2.5n + n2 = 0 + 2

Combine like terms: 0 + 2 = 2
-2.5n + n2 = 2

The n term is -2.5n.  Take half its coefficient (-1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
-2.5n + 1.5625 + n2 = 2 + 1.5625

Reorder the terms:
1.5625 + -2.5n + n2 = 2 + 1.5625

Combine like terms: 2 + 1.5625 = 3.5625
1.5625 + -2.5n + n2 = 3.5625

Factor a perfect square on the left side:
(n + -1.25)(n + -1.25) = 3.5625

Calculate the square root of the right side: 1.887458609

Break this problem into two subproblems by setting 
(n + -1.25) equal to 1.887458609 and -1.887458609.

Subproblem 1
n + -1.25 = 1.887458609

Simplifying
n + -1.25 = 1.887458609

Reorder the terms:
-1.25 + n = 1.887458609

Solving
-1.25 + n = 1.887458609

Solving for variable 'n'.

Move all terms containing n to the left, all other terms to the right.

Add '1.25' to each side of the equation.
-1.25 + 1.25 + n = 1.887458609 + 1.25

Combine like terms: -1.25 + 1.25 = 0.00
0.00 + n = 1.887458609 + 1.25
n = 1.887458609 + 1.25

Combine like terms: 1.887458609 + 1.25 = 3.137458609
n = 3.137458609

Simplifying
n = 3.137458609

Subproblem 2
n + -1.25 = -1.887458609

Simplifying
n + -1.25 = -1.887458609

Reorder the terms:
-1.25 + n = -1.887458609

Solving
-1.25 + n = -1.887458609

Solving for variable 'n'.

Move all terms containing n to the left, all other terms to the right.

Add '1.25' to each side of the equation.
-1.25 + 1.25 + n = -1.887458609 + 1.25

Combine like terms: -1.25 + 1.25 = 0.00
0.00 + n = -1.887458609 + 1.25
n = -1.887458609 + 1.25

Combine like terms: -1.887458609 + 1.25 = -0.637458609
n = -0.637458609

Simplifying
n = -0.637458609

Solution
The solution to the problem is based on the solutions
from the subproblems.
n = {3.137458609, -0.637458609}