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Coefficient problem


Hi,

Now I'm trying to calculate this formula:

Delta[eq_, x_]:=Coefficient[eq, x]^2 - 4 Coefficient[eq, x^2] Coefficient[eq, x^0]

eq has this form a x^2 + b x + c

But there is a problem with the x^0 coefficient!
How can I overcome that?

Thanks!

CeZaR


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