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CAS: Combining Logarithms
07-09-2019, 02:27 PM
Post: #1
CAS: Combining Logarithms
From an intermediate algebra class example:

   

How would this be implemented in the hp prime?

-Dale-
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07-09-2019, 05:25 PM
Post: #2
RE: CAS: Combining Logarithms
Hi.

Pretty sure it's not the best way, but I did it like this:

Code:
#cas
combineLog(expr1,resBase):=
BEGIN
LOCAL res;

expr1:=lncollect(expr1);
res:=solve(expr("expr1=logb(k,resBase)"),k);

RETURN(logb(res,resBase));
END;
#end

Just make sure CAS has "Use i" enabled.

-Victor


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07-09-2019, 06:38 PM
Post: #3
RE: CAS: Combining Logarithms
(07-09-2019 05:25 PM)victorvbc Wrote:  Just make sure CAS has "Use i" enabled.

-Victor

Thanks, I didn't have "Use i" enabled.
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