3n(n-5)=50

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Solution for 3n(n-5)=50 equation:


Simplifying
3n(n + -5) = 50

Reorder the terms:
3n(-5 + n) = 50
(-5 * 3n + n * 3n) = 50
(-15n + 3n2) = 50

Solving
-15n + 3n2 = 50

Solving for variable 'n'.

Reorder the terms:
-50 + -15n + 3n2 = 50 + -50

Combine like terms: 50 + -50 = 0
-50 + -15n + 3n2 = 0

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

Divide each side by '3'.
-16.66666667 + -5n + n2 = 0

Move the constant term to the right:

Add '16.66666667' to each side of the equation.
-16.66666667 + -5n + 16.66666667 + n2 = 0 + 16.66666667

Reorder the terms:
-16.66666667 + 16.66666667 + -5n + n2 = 0 + 16.66666667

Combine like terms: -16.66666667 + 16.66666667 = 0.00000000
0.00000000 + -5n + n2 = 0 + 16.66666667
-5n + n2 = 0 + 16.66666667

Combine like terms: 0 + 16.66666667 = 16.66666667
-5n + n2 = 16.66666667

The n term is -5n.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5n + 6.25 + n2 = 16.66666667 + 6.25

Reorder the terms:
6.25 + -5n + n2 = 16.66666667 + 6.25

Combine like terms: 16.66666667 + 6.25 = 22.91666667
6.25 + -5n + n2 = 22.91666667

Factor a perfect square on the left side:
(n + -2.5)(n + -2.5) = 22.91666667

Calculate the square root of the right side: 4.787135539

Break this problem into two subproblems by setting 
(n + -2.5) equal to 4.787135539 and -4.787135539.

Subproblem 1

n + -2.5 = 4.787135539 Simplifying n + -2.5 = 4.787135539 Reorder the terms: -2.5 + n = 4.787135539 Solving -2.5 + n = 4.787135539 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + n = 4.787135539 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + n = 4.787135539 + 2.5 n = 4.787135539 + 2.5 Combine like terms: 4.787135539 + 2.5 = 7.287135539 n = 7.287135539 Simplifying n = 7.287135539

Subproblem 2

n + -2.5 = -4.787135539 Simplifying n + -2.5 = -4.787135539 Reorder the terms: -2.5 + n = -4.787135539 Solving -2.5 + n = -4.787135539 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + n = -4.787135539 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + n = -4.787135539 + 2.5 n = -4.787135539 + 2.5 Combine like terms: -4.787135539 + 2.5 = -2.287135539 n = -2.287135539 Simplifying n = -2.287135539

Solution

The solution to the problem is based on the solutions from the subproblems. n = {7.287135539, -2.287135539}

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