# [LON-CAPA-users] Having an equation or a range as a response

Seema Ali sali at vsb.bc.ca
Fri Jan 20 01:03:39 EST 2012

```Thank you Gerd!

That worked well. I changed one of the lines to
if (&cas('maxima',"(\$left)-(\$b)-(y-\$right)") eq '0') { return 'EXACT_ANS'; }

Just in case someone decides to enter 8=y. =]

-----Original Message-----
From: lon-capa-users-bounces at mail.lon-capa.org on behalf of Gerd Kortemeyer
Sent: Thu 1/19/2012 8:17 PM
To: Discussion list for LON-CAPA users
Subject: Re: [LON-CAPA-users] Having an equation or a range as a response

Hi,

On Jan 19, 2012, at 9:51 PM, Gerd Kortemeyer wrote:
>
>
> On Jan 19, 2012, at 8:39 PM, Seema Ali wrote:
>
>> An example would be:
>>
>> State the equation for the asymptote for the graph y=10^(x+7)+8.
>>
>
> So that would be x=7 or y=8, correct?

Not sure anymore how I got to that x-solution, except that I just looked at the Google plot :-) In any case, I hope the sample code is useful, just eliminate the second solution.

For more complex equations, you need to wrap the MAXIMA-code into trigsimp(trigreduce(.)), so MAXIMA bothers simplifying the expression beyond the basics. When I have more time, I'll make a nice template for an "equation problem."

What else?

- Gerd.

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