6n-n^2=40

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Solution for 6n-n^2=40 equation:


Simplifying
6n + -1n2 = 40

Solving
6n + -1n2 = 40

Solving for variable 'n'.

Reorder the terms:
-40 + 6n + -1n2 = 40 + -40

Combine like terms: 40 + -40 = 0
-40 + 6n + -1n2 = 0

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

Divide each side by '-1'.
40 + -6n + n2 = 0

Move the constant term to the right:

Add '-40' to each side of the equation.
40 + -6n + -40 + n2 = 0 + -40

Reorder the terms:
40 + -40 + -6n + n2 = 0 + -40

Combine like terms: 40 + -40 = 0
0 + -6n + n2 = 0 + -40
-6n + n2 = 0 + -40

Combine like terms: 0 + -40 = -40
-6n + n2 = -40

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 = -40 + 9

Reorder the terms:
9 + -6n + n2 = -40 + 9

Combine like terms: -40 + 9 = -31
9 + -6n + n2 = -31

Factor a perfect square on the left side:
(n + -3)(n + -3) = -31

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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