n(n-6)=9

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Solution for n(n-6)=9 equation:


Simplifying
n(n + -6) = 9

Reorder the terms:
n(-6 + n) = 9
(-6 * n + n * n) = 9
(-6n + n2) = 9

Solving
-6n + n2 = 9

Solving for variable 'n'.

Reorder the terms:
-9 + -6n + n2 = 9 + -9

Combine like terms: 9 + -9 = 0
-9 + -6n + n2 = 0

Begin completing the square.

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + -6n + 9 + n2 = 0 + 9

Reorder the terms:
-9 + 9 + -6n + n2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -6n + n2 = 0 + 9
-6n + n2 = 0 + 9

Combine like terms: 0 + 9 = 9
-6n + n2 = 9

The n term is -6n.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6n + 9 + n2 = 9 + 9

Reorder the terms:
9 + -6n + n2 = 9 + 9

Combine like terms: 9 + 9 = 18
9 + -6n + n2 = 18

Factor a perfect square on the left side:
(n + -3)(n + -3) = 18

Calculate the square root of the right side: 4.242640687

Break this problem into two subproblems by setting 
(n + -3) equal to 4.242640687 and -4.242640687.

Subproblem 1

n + -3 = 4.242640687 Simplifying n + -3 = 4.242640687 Reorder the terms: -3 + n = 4.242640687 Solving -3 + n = 4.242640687 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + n = 4.242640687 + 3 Combine like terms: -3 + 3 = 0 0 + n = 4.242640687 + 3 n = 4.242640687 + 3 Combine like terms: 4.242640687 + 3 = 7.242640687 n = 7.242640687 Simplifying n = 7.242640687

Subproblem 2

n + -3 = -4.242640687 Simplifying n + -3 = -4.242640687 Reorder the terms: -3 + n = -4.242640687 Solving -3 + n = -4.242640687 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + n = -4.242640687 + 3 Combine like terms: -3 + 3 = 0 0 + n = -4.242640687 + 3 n = -4.242640687 + 3 Combine like terms: -4.242640687 + 3 = -1.242640687 n = -1.242640687 Simplifying n = -1.242640687

Solution

The solution to the problem is based on the solutions from the subproblems. n = {7.242640687, -1.242640687}

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