1125=n(n-3)

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Solution for 1125=n(n-3) equation:


Simplifying
1125 = n(n + -3)

Reorder the terms:
1125 = n(-3 + n)
1125 = (-3 * n + n * n)
1125 = (-3n + n2)

Solving
1125 = -3n + n2

Solving for variable 'n'.

Reorder the terms:
1125 + 3n + -1n2 = -3n + 3n + n2 + -1n2

Combine like terms: -3n + 3n = 0
1125 + 3n + -1n2 = 0 + n2 + -1n2
1125 + 3n + -1n2 = n2 + -1n2

Combine like terms: n2 + -1n2 = 0
1125 + 3n + -1n2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-1125 + -3n + n2 = 0

Move the constant term to the right:

Add '1125' to each side of the equation.
-1125 + -3n + 1125 + n2 = 0 + 1125

Reorder the terms:
-1125 + 1125 + -3n + n2 = 0 + 1125

Combine like terms: -1125 + 1125 = 0
0 + -3n + n2 = 0 + 1125
-3n + n2 = 0 + 1125

Combine like terms: 0 + 1125 = 1125
-3n + n2 = 1125

The n term is -3n.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3n + 2.25 + n2 = 1125 + 2.25

Reorder the terms:
2.25 + -3n + n2 = 1125 + 2.25

Combine like terms: 1125 + 2.25 = 1127.25
2.25 + -3n + n2 = 1127.25

Factor a perfect square on the left side:
(n + -1.5)(n + -1.5) = 1127.25

Calculate the square root of the right side: 33.574543928

Break this problem into two subproblems by setting 
(n + -1.5) equal to 33.574543928 and -33.574543928.

Subproblem 1

n + -1.5 = 33.574543928 Simplifying n + -1.5 = 33.574543928 Reorder the terms: -1.5 + n = 33.574543928 Solving -1.5 + n = 33.574543928 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + n = 33.574543928 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + n = 33.574543928 + 1.5 n = 33.574543928 + 1.5 Combine like terms: 33.574543928 + 1.5 = 35.074543928 n = 35.074543928 Simplifying n = 35.074543928

Subproblem 2

n + -1.5 = -33.574543928 Simplifying n + -1.5 = -33.574543928 Reorder the terms: -1.5 + n = -33.574543928 Solving -1.5 + n = -33.574543928 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + n = -33.574543928 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + n = -33.574543928 + 1.5 n = -33.574543928 + 1.5 Combine like terms: -33.574543928 + 1.5 = -32.074543928 n = -32.074543928 Simplifying n = -32.074543928

Solution

The solution to the problem is based on the solutions from the subproblems. n = {35.074543928, -32.074543928}

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