2n^2-4n-26=-5

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Solution for 2n^2-4n-26=-5 equation:


Simplifying
2n2 + -4n + -26 = -5

Reorder the terms:
-26 + -4n + 2n2 = -5

Solving
-26 + -4n + 2n2 = -5

Solving for variable 'n'.

Reorder the terms:
-26 + 5 + -4n + 2n2 = -5 + 5

Combine like terms: -26 + 5 = -21
-21 + -4n + 2n2 = -5 + 5

Combine like terms: -5 + 5 = 0
-21 + -4n + 2n2 = 0

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

Divide each side by '2'.
-10.5 + -2n + n2 = 0

Move the constant term to the right:

Add '10.5' to each side of the equation.
-10.5 + -2n + 10.5 + n2 = 0 + 10.5

Reorder the terms:
-10.5 + 10.5 + -2n + n2 = 0 + 10.5

Combine like terms: -10.5 + 10.5 = 0.0
0.0 + -2n + n2 = 0 + 10.5
-2n + n2 = 0 + 10.5

Combine like terms: 0 + 10.5 = 10.5
-2n + n2 = 10.5

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 = 10.5 + 1

Reorder the terms:
1 + -2n + n2 = 10.5 + 1

Combine like terms: 10.5 + 1 = 11.5
1 + -2n + n2 = 11.5

Factor a perfect square on the left side:
(n + -1)(n + -1) = 11.5

Calculate the square root of the right side: 3.391164992

Break this problem into two subproblems by setting 
(n + -1) equal to 3.391164992 and -3.391164992.

Subproblem 1

n + -1 = 3.391164992 Simplifying n + -1 = 3.391164992 Reorder the terms: -1 + n = 3.391164992 Solving -1 + n = 3.391164992 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 = 3.391164992 + 1 Combine like terms: -1 + 1 = 0 0 + n = 3.391164992 + 1 n = 3.391164992 + 1 Combine like terms: 3.391164992 + 1 = 4.391164992 n = 4.391164992 Simplifying n = 4.391164992

Subproblem 2

n + -1 = -3.391164992 Simplifying n + -1 = -3.391164992 Reorder the terms: -1 + n = -3.391164992 Solving -1 + n = -3.391164992 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 = -3.391164992 + 1 Combine like terms: -1 + 1 = 0 0 + n = -3.391164992 + 1 n = -3.391164992 + 1 Combine like terms: -3.391164992 + 1 = -2.391164992 n = -2.391164992 Simplifying n = -2.391164992

Solution

The solution to the problem is based on the solutions from the subproblems. n = {4.391164992, -2.391164992}

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