2925=n(17.5+2.5n)

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Solution for 2925=n(17.5+2.5n) equation:


Simplifying
2925 = n(17.5 + 2.5n)
2925 = (17.5 * n + 2.5n * n)
2925 = (17.5n + 2.5n2)

Solving
2925 = 17.5n + 2.5n2

Solving for variable 'n'.

Reorder the terms:
2925 + -17.5n + -2.5n2 = 17.5n + -17.5n + 2.5n2 + -2.5n2

Combine like terms: 17.5n + -17.5n = 0.0
2925 + -17.5n + -2.5n2 = 0.0 + 2.5n2 + -2.5n2
2925 + -17.5n + -2.5n2 = 2.5n2 + -2.5n2

Combine like terms: 2.5n2 + -2.5n2 = 0.0
2925 + -17.5n + -2.5n2 = 0.0

Begin completing the square.  Divide all terms by
-2.5 the coefficient of the squared term: 

Divide each side by '-2.5'.
-1170 + 7n + n2 = 0

Move the constant term to the right:

Add '1170' to each side of the equation.
-1170 + 7n + 1170 + n2 = 0 + 1170

Reorder the terms:
-1170 + 1170 + 7n + n2 = 0 + 1170

Combine like terms: -1170 + 1170 = 0
0 + 7n + n2 = 0 + 1170
7n + n2 = 0 + 1170

Combine like terms: 0 + 1170 = 1170
7n + n2 = 1170

The n term is 7n.  Take half its coefficient (3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
7n + 12.25 + n2 = 1170 + 12.25

Reorder the terms:
12.25 + 7n + n2 = 1170 + 12.25

Combine like terms: 1170 + 12.25 = 1182.25
12.25 + 7n + n2 = 1182.25

Factor a perfect square on the left side:
(n + 3.5)(n + 3.5) = 1182.25

Calculate the square root of the right side: 34.383862494

Break this problem into two subproblems by setting 
(n + 3.5) equal to 34.383862494 and -34.383862494.

Subproblem 1

n + 3.5 = 34.383862494 Simplifying n + 3.5 = 34.383862494 Reorder the terms: 3.5 + n = 34.383862494 Solving 3.5 + n = 34.383862494 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + n = 34.383862494 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + n = 34.383862494 + -3.5 n = 34.383862494 + -3.5 Combine like terms: 34.383862494 + -3.5 = 30.883862494 n = 30.883862494 Simplifying n = 30.883862494

Subproblem 2

n + 3.5 = -34.383862494 Simplifying n + 3.5 = -34.383862494 Reorder the terms: 3.5 + n = -34.383862494 Solving 3.5 + n = -34.383862494 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + n = -34.383862494 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + n = -34.383862494 + -3.5 n = -34.383862494 + -3.5 Combine like terms: -34.383862494 + -3.5 = -37.883862494 n = -37.883862494 Simplifying n = -37.883862494

Solution

The solution to the problem is based on the solutions from the subproblems. n = {30.883862494, -37.883862494}

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