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Tim Wessman · (This post was last modified: 03-21-2016 05:13 PM by Tim Wessman.)

You running a very out of date version?

[Image: examples.png]

(03-21-2016 04:21 PM)Aries Wrote: Solve({x^2+2*x+1>0,x^2-8*x<=0})

Works fine...

http://www.wolframalpha.com/input/?i=sol...89%A40}%29

Quote:Solve({logb2(2*x+17)-logb2(x+10)=logb2(-x-4)-3})

[...]

Is x=-22 part of the domain ?

Yes. Unless restricted to real.

http://www.wolframalpha.com/input/?i=sol...4%29-3}%29

Quote:Solve({logb2(x+5)=logb4(x+7) [...] The Prime does not seem to be able to change the base on its own.

Yup, you can still get the result though. Maybe the author of the CAS will chime in as to why the exact solve does not work.

You are going to find much more capability and advanced features in the prime CAS that can't be done on any other "calculator" then you will find things the prime CAS doesn't handle.

Note that I am not saying it is perfect. In fact, I think its biggest weakness is that the effort has not been in making "simple" things work well and returning "nice" results and hence it tends to fail in some simple things other cas systems have no issue with. The author has an assumption of users being able to do things and recognize different forms of answers that is probably much higher then a lot of other more basic CAS systems.