(n^2)-4n+5=8

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Solution for (n^2)-4n+5=8 equation:


Simplifying
(n2) + -4n + 5 = 8
n2 + -4n + 5 = 8

Reorder the terms:
5 + -4n + n2 = 8

Solving
5 + -4n + n2 = 8

Solving for variable 'n'.

Reorder the terms:
5 + -8 + -4n + n2 = 8 + -8

Combine like terms: 5 + -8 = -3
-3 + -4n + n2 = 8 + -8

Combine like terms: 8 + -8 = 0
-3 + -4n + n2 = 0

Begin completing the square.

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + -4n + 3 + n2 = 0 + 3

Reorder the terms:
-3 + 3 + -4n + n2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + -4n + n2 = 0 + 3
-4n + n2 = 0 + 3

Combine like terms: 0 + 3 = 3
-4n + n2 = 3

The n term is -4n.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4n + 4 + n2 = 3 + 4

Reorder the terms:
4 + -4n + n2 = 3 + 4

Combine like terms: 3 + 4 = 7
4 + -4n + n2 = 7

Factor a perfect square on the left side:
(n + -2)(n + -2) = 7

Calculate the square root of the right side: 2.645751311

Break this problem into two subproblems by setting 
(n + -2) equal to 2.645751311 and -2.645751311.

Subproblem 1

n + -2 = 2.645751311 Simplifying n + -2 = 2.645751311 Reorder the terms: -2 + n = 2.645751311 Solving -2 + n = 2.645751311 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + n = 2.645751311 + 2 Combine like terms: -2 + 2 = 0 0 + n = 2.645751311 + 2 n = 2.645751311 + 2 Combine like terms: 2.645751311 + 2 = 4.645751311 n = 4.645751311 Simplifying n = 4.645751311

Subproblem 2

n + -2 = -2.645751311 Simplifying n + -2 = -2.645751311 Reorder the terms: -2 + n = -2.645751311 Solving -2 + n = -2.645751311 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + n = -2.645751311 + 2 Combine like terms: -2 + 2 = 0 0 + n = -2.645751311 + 2 n = -2.645751311 + 2 Combine like terms: -2.645751311 + 2 = -0.645751311 n = -0.645751311 Simplifying n = -0.645751311

Solution

The solution to the problem is based on the solutions from the subproblems. n = {4.645751311, -0.645751311}

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