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Re: question about HoldForm

• To: mathgroup at smc.vnet.net
• Subject: [mg60786] Re: [mg60777] question about HoldForm
• From: Andrzej Kozlowski <andrzej at yhc.att.ne.jp>
• Date: Thu, 29 Sep 2005 05:40:54 -0400 (EDT)
• References: <200509280541.BAA08384@smc.vnet.net>
• Reply-to: Andrzej Kozlowski <andrzej at akikoz.net>
• Sender: owner-wri-mathgroup at wolfram.com

On 28 Sep 2005, at 14:41, Ruth Lazkoz wrote:

>
> Hi,
>
> I have this expression
>
> x = 2; HoldForm[x^2 + 4x + 4]
>
> Is there a way to operate on HoldForm so that I get (x^2+2)^2? If I  
> cut
> a paste the result and operate on it I obviously get 16.
>
> Thanks,
>
> Ruth
>
>
>

Do you mean (x+2)^2?
Assuming so one possible way is something like this:


x = 2; v = HoldForm[x^2 + 4*x + 4];


Block[{x}, HoldForm[Evaluate[v /. HoldForm[u_] :> Factor[u]]]]


HoldForm[(x + 2)^2]

Andrzej Kozlowski

• References:
  • question about HoldForm
    • From: "Ruth Lazkoz" <ruth.lazkoz@ehu.es>