CAS: Combining Logarithms

[DrD]

From an intermediate algebra class example:

[attachment=7452]

How would this be implemented in the hp prime?

-Dale-

[victorvbc]

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

[DrD]

(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.