n^2-4n-54=0

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Solution for n^2-4n-54=0 equation:


Simplifying
n2 + -4n + -54 = 0

Reorder the terms:
-54 + -4n + n2 = 0

Solving
-54 + -4n + n2 = 0

Solving for variable 'n'.

Begin completing the square.

Move the constant term to the right:

Add '54' to each side of the equation.
-54 + -4n + 54 + n2 = 0 + 54

Reorder the terms:
-54 + 54 + -4n + n2 = 0 + 54

Combine like terms: -54 + 54 = 0
0 + -4n + n2 = 0 + 54
-4n + n2 = 0 + 54

Combine like terms: 0 + 54 = 54
-4n + n2 = 54

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 = 54 + 4

Reorder the terms:
4 + -4n + n2 = 54 + 4

Combine like terms: 54 + 4 = 58
4 + -4n + n2 = 58

Factor a perfect square on the left side:
(n + -2)(n + -2) = 58

Calculate the square root of the right side: 7.615773106

Break this problem into two subproblems by setting 
(n + -2) equal to 7.615773106 and -7.615773106.

Subproblem 1

n + -2 = 7.615773106 Simplifying n + -2 = 7.615773106 Reorder the terms: -2 + n = 7.615773106 Solving -2 + n = 7.615773106 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 = 7.615773106 + 2 Combine like terms: -2 + 2 = 0 0 + n = 7.615773106 + 2 n = 7.615773106 + 2 Combine like terms: 7.615773106 + 2 = 9.615773106 n = 9.615773106 Simplifying n = 9.615773106

Subproblem 2

n + -2 = -7.615773106 Simplifying n + -2 = -7.615773106 Reorder the terms: -2 + n = -7.615773106 Solving -2 + n = -7.615773106 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 = -7.615773106 + 2 Combine like terms: -2 + 2 = 0 0 + n = -7.615773106 + 2 n = -7.615773106 + 2 Combine like terms: -7.615773106 + 2 = -5.615773106 n = -5.615773106 Simplifying n = -5.615773106

Solution

The solution to the problem is based on the solutions from the subproblems. n = {9.615773106, -5.615773106}

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