n(n-1)=180

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Solution for n(n-1)=180 equation:


Simplifying
n(n + -1) = 180

Reorder the terms:
n(-1 + n) = 180
(-1 * n + n * n) = 180
(-1n + n2) = 180

Solving
-1n + n2 = 180

Solving for variable 'n'.

Reorder the terms:
-180 + -1n + n2 = 180 + -180

Combine like terms: 180 + -180 = 0
-180 + -1n + n2 = 0

Begin completing the square.

Move the constant term to the right:

Add '180' to each side of the equation.
-180 + -1n + 180 + n2 = 0 + 180

Reorder the terms:
-180 + 180 + -1n + n2 = 0 + 180

Combine like terms: -180 + 180 = 0
0 + -1n + n2 = 0 + 180
-1n + n2 = 0 + 180

Combine like terms: 0 + 180 = 180
-1n + n2 = 180

The n term is -1n.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1n + 0.25 + n2 = 180 + 0.25

Reorder the terms:
0.25 + -1n + n2 = 180 + 0.25

Combine like terms: 180 + 0.25 = 180.25
0.25 + -1n + n2 = 180.25

Factor a perfect square on the left side:
(n + -0.5)(n + -0.5) = 180.25

Calculate the square root of the right side: 13.425721582

Break this problem into two subproblems by setting 
(n + -0.5) equal to 13.425721582 and -13.425721582.

Subproblem 1

n + -0.5 = 13.425721582 Simplifying n + -0.5 = 13.425721582 Reorder the terms: -0.5 + n = 13.425721582 Solving -0.5 + n = 13.425721582 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + n = 13.425721582 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + n = 13.425721582 + 0.5 n = 13.425721582 + 0.5 Combine like terms: 13.425721582 + 0.5 = 13.925721582 n = 13.925721582 Simplifying n = 13.925721582

Subproblem 2

n + -0.5 = -13.425721582 Simplifying n + -0.5 = -13.425721582 Reorder the terms: -0.5 + n = -13.425721582 Solving -0.5 + n = -13.425721582 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + n = -13.425721582 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + n = -13.425721582 + 0.5 n = -13.425721582 + 0.5 Combine like terms: -13.425721582 + 0.5 = -12.925721582 n = -12.925721582 Simplifying n = -12.925721582

Solution

The solution to the problem is based on the solutions from the subproblems. n = {13.925721582, -12.925721582}

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