Hi,

I have an expression that I need to simplify:

$\displaystyle (i - n)(i - m)(i - y)(i - s)$

I know how to simplify this algebraically using the FOIL method. I did it and I have the answer, but I'm really hoping there might be a different way to do it. Is there an easier way to simplify long algebraic expressions like this, especially given that i is a factor in each part?