f(n)=n^2-n

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Solution for f(n)=n^2-n equation: 


Simplifying
f(n) = n2 + -1n

Multiply f * n
fn = n2 + -1n

Reorder the terms:
fn = -1n + n2

Solving
fn = -1n + n2

Solving for variable 'f'.

Move all terms containing f to the left, all other terms to the right.

Divide each side by 'n'.
f = -1 + n

Simplifying
f = -1 + n

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