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


In article <45d1n0$63m at ralph.vnet.net>, txp at pi.net says...
>
>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
>below to X-axis at about q=15
>
>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 !
>

The horizontal plot axis is probably not y=0.  You can force it to be using 
the AxesOrigin option.  Try this:

Plot[GTK[q], {q, 0, 30}, AxesOrigin -> {0,0}]




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