4n-(n-65)n=100

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Solution for 4n-(n-65)n=100 equation:


Simplifying
4n + -1(n + -65) * n = 100

Reorder the terms:
4n + -1(-65 + n) * n = 100

Reorder the terms for easier multiplication:
4n + -1n(-65 + n) = 100
4n + (-65 * -1n + n * -1n) = 100
4n + (65n + -1n2) = 100

Combine like terms: 4n + 65n = 69n
69n + -1n2 = 100

Solving
69n + -1n2 = 100

Solving for variable 'n'.

Reorder the terms:
-100 + 69n + -1n2 = 100 + -100

Combine like terms: 100 + -100 = 0
-100 + 69n + -1n2 = 0

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

Divide each side by '-1'.
100 + -69n + n2 = 0

Move the constant term to the right:

Add '-100' to each side of the equation.
100 + -69n + -100 + n2 = 0 + -100

Reorder the terms:
100 + -100 + -69n + n2 = 0 + -100

Combine like terms: 100 + -100 = 0
0 + -69n + n2 = 0 + -100
-69n + n2 = 0 + -100

Combine like terms: 0 + -100 = -100
-69n + n2 = -100

The n term is -69n.  Take half its coefficient (-34.5).
Square it (1190.25) and add it to both sides.

Add '1190.25' to each side of the equation.
-69n + 1190.25 + n2 = -100 + 1190.25

Reorder the terms:
1190.25 + -69n + n2 = -100 + 1190.25

Combine like terms: -100 + 1190.25 = 1090.25
1190.25 + -69n + n2 = 1090.25

Factor a perfect square on the left side:
(n + -34.5)(n + -34.5) = 1090.25

Calculate the square root of the right side: 33.018933962

Break this problem into two subproblems by setting 
(n + -34.5) equal to 33.018933962 and -33.018933962.

Subproblem 1

n + -34.5 = 33.018933962 Simplifying n + -34.5 = 33.018933962 Reorder the terms: -34.5 + n = 33.018933962 Solving -34.5 + n = 33.018933962 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '34.5' to each side of the equation. -34.5 + 34.5 + n = 33.018933962 + 34.5 Combine like terms: -34.5 + 34.5 = 0.0 0.0 + n = 33.018933962 + 34.5 n = 33.018933962 + 34.5 Combine like terms: 33.018933962 + 34.5 = 67.518933962 n = 67.518933962 Simplifying n = 67.518933962

Subproblem 2

n + -34.5 = -33.018933962 Simplifying n + -34.5 = -33.018933962 Reorder the terms: -34.5 + n = -33.018933962 Solving -34.5 + n = -33.018933962 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '34.5' to each side of the equation. -34.5 + 34.5 + n = -33.018933962 + 34.5 Combine like terms: -34.5 + 34.5 = 0.0 0.0 + n = -33.018933962 + 34.5 n = -33.018933962 + 34.5 Combine like terms: -33.018933962 + 34.5 = 1.481066038 n = 1.481066038 Simplifying n = 1.481066038

Solution

The solution to the problem is based on the solutions from the subproblems. n = {67.518933962, 1.481066038}

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