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Help !! plot roots of an expression

• To: mathgroup at smc.vnet.net
• Subject: [mg72349] Help !! plot roots of an expression
• From: "mintoo" <varun.tangri at gmail.com>
• Date: Tue, 26 Dec 2006 07:31:02 -0500 (EST)

I have a polynomial. A simple example is like this

(w-w1) (w + 2  q +en^2 +  s w^3) + r
The actual example is more complicated.  It is a function of several
variables e.g. q, en, s, r etc..
I also need to Collect & FullSimplify this expression.
Finally, from that result, I want to plot the roots of this polynomial
(imaginary & real part) vs. q (say) or vs en etc.. other variables can
be given fixed values.

I'll the thankful if you give me hints how to do this!!