       Re: Why gives Plot[GTK,{q,o,30}] negat. min. at q=15 ? (GTK:=1/3 q^2 - 10 q + 100)

• Subject: [mg2202] Re: [mg2170] Why gives Plot[GTK,{q,o,30}] negat. min. at q=15 ? (GTK:=1/3 q^2 - 10 q + 100)
• From: me at talmanl.mscd.edu (Lou Talman)
• Date: Mon, 16 Oct 1995 15:52:22 GMT
• Approved: usenet@wri.com
• Distribution: local
• Newsgroups: wri.mathgroup
• Organization: Wolfram Research, Inc.
• Sender: daemon at wri.com ( )

```Read the scale on your vertical axis, Jan.

--Lou Talman

Begin Forwarded Message:

Say GTK = ATC = Average Total Cost := 1/3 q^2 - 10 q + 100

When I give Plot[GTK,{q,0,30}] the resulting graph gives a minimum

When I give q=15 and N[GTK] it evaluates correctly to GTK=25.

What am I doing wrong ?  Thanks for any effort you take !

------------- GMT 16.15
Jan Holland
txp at pi.net
"A fact is a broken dream"

```

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