
#1
May1907, 08:35 PM

P: 1

Hi,
I'm working out some problems on my TI89 Titanium, and I've run into a roadblock. How do I put a base for a log? Thanks a lot. 



#2
May2007, 01:10 PM

P: 308

ln(thing you want the log of) / ln(base of the log)
As far as I know, that's the only way to do it on a TI. but it's not hard. 



#3
May2007, 02:51 PM

P: 483

That's the way I do it; just the standard log change of base formula. So ln(2) is just the log of 2, and ln(2)/ln(10) is log of 2, base 10. You can also see that ln(2)/ln(e), the base e log which is the natural log, will be just ln(2) since ln(e) evaluates to 1.




#4
May2207, 02:09 PM

P: 90

Need help with TI89 Titanium
I borrow this thread a little if its okey..
I got a problem with mine TI89. Whay I want to calculate a root i press "diamond + 9 + x + , + y + enter" which should give me x^1/y. But all i get is what i just pressed, i.e. the answer i get is root(x,y). Please help me. 



#5
May2207, 02:36 PM

P: 483

To find a root of x, use the zeros() function. Type zeros(expression,variable), or, alternatively, solve(equation,variable), when the equation is the same expression but set to zero, and the variable is x.
zeros(4x^2+3x+5,x) or solve(4x^2+3x+5=0,x) returns the roots. 



#6
May2207, 02:39 PM

P: 90

Okey, but do you know where the problem for the root function could lie?
Could it be any setting? EDIT: The problem was that I had changed languege... It now works again. 



#7
May2407, 07:20 PM

P: 90

another way to do log is to log(number, base)




#9
Jun2707, 07:45 PM

P: 2,057

I think he has one of those Apps like Omnicalc to upgrade the features kind of. That's also one way you can do it, just with a comma. Change of base requires a little more typing.




#10
Apr2010, 09:23 PM

P: 1

if you press the yellow Diamond button and then press 7 then log will show up. much less typing for all you lazy people like me




#11
Mar1011, 01:34 PM

P: 2

x=4 


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