325=n(120-n)+50n

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Solution for 325=n(120-n)+50n equation:


Simplifying
325 = n(120 + -1n) + 50n
325 = (120 * n + -1n * n) + 50n
325 = (120n + -1n2) + 50n

Reorder the terms:
325 = 120n + 50n + -1n2

Combine like terms: 120n + 50n = 170n
325 = 170n + -1n2

Solving
325 = 170n + -1n2

Solving for variable 'n'.

Reorder the terms:
325 + -170n + n2 = 170n + -170n + -1n2 + n2

Combine like terms: 170n + -170n = 0
325 + -170n + n2 = 0 + -1n2 + n2
325 + -170n + n2 = -1n2 + n2

Combine like terms: -1n2 + n2 = 0
325 + -170n + n2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-325' to each side of the equation.
325 + -170n + -325 + n2 = 0 + -325

Reorder the terms:
325 + -325 + -170n + n2 = 0 + -325

Combine like terms: 325 + -325 = 0
0 + -170n + n2 = 0 + -325
-170n + n2 = 0 + -325

Combine like terms: 0 + -325 = -325
-170n + n2 = -325

The n term is -170n.  Take half its coefficient (-85).
Square it (7225) and add it to both sides.

Add '7225' to each side of the equation.
-170n + 7225 + n2 = -325 + 7225

Reorder the terms:
7225 + -170n + n2 = -325 + 7225

Combine like terms: -325 + 7225 = 6900
7225 + -170n + n2 = 6900

Factor a perfect square on the left side:
(n + -85)(n + -85) = 6900

Calculate the square root of the right side: 83.066238629

Break this problem into two subproblems by setting 
(n + -85) equal to 83.066238629 and -83.066238629.

Subproblem 1

n + -85 = 83.066238629 Simplifying n + -85 = 83.066238629 Reorder the terms: -85 + n = 83.066238629 Solving -85 + n = 83.066238629 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '85' to each side of the equation. -85 + 85 + n = 83.066238629 + 85 Combine like terms: -85 + 85 = 0 0 + n = 83.066238629 + 85 n = 83.066238629 + 85 Combine like terms: 83.066238629 + 85 = 168.066238629 n = 168.066238629 Simplifying n = 168.066238629

Subproblem 2

n + -85 = -83.066238629 Simplifying n + -85 = -83.066238629 Reorder the terms: -85 + n = -83.066238629 Solving -85 + n = -83.066238629 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '85' to each side of the equation. -85 + 85 + n = -83.066238629 + 85 Combine like terms: -85 + 85 = 0 0 + n = -83.066238629 + 85 n = -83.066238629 + 85 Combine like terms: -83.066238629 + 85 = 1.933761371 n = 1.933761371 Simplifying n = 1.933761371

Solution

The solution to the problem is based on the solutions from the subproblems. n = {168.066238629, 1.933761371}

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