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MathGroup Archive 2002

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Re: Coefficient problem

  • To: mathgroup at smc.vnet.net
  • Subject: [mg36449] Re: [mg36421] Coefficient problem
  • From: BobHanlon at aol.com
  • Date: Sat, 7 Sep 2002 02:54:07 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

In a message dated 9/6/02 3:28:56 AM, pascal at go.ro writes:

>
>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?

see on-line help for Coefficient

delta[eq_, x_] := 
    Coefficient[eq, x, 1]^2 - 4 *Coefficient[eq, x, 2] *Coefficient[eq, x, 0];

eq = a*x^2 + b*x + c;

delta[eq, x]

b^2 - 4*a*c


Bob Hanlon


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