# Thread: Performing Logarithmic Functions on a TI84 plus...

1. ## Performing Logarithmic Functions on a TI84 plus...

Does anybody have any insight on how to perform log functions on a TI graphing calculator? Because I clearly do not know how to. I know that
log4 times 8 is supposed to give me 3/2 but when I did it on my TI84 plus it gave me 4.8 something, so, anybody??? Help???

2. Hello,

Why is it supposed to give you 3/2 ?

3. Because thats what the answer is in the back of the book....

4. Ok, in what base is it ?

And is it $\displaystyle \log(4*8)$ or $\displaystyle 8 \log(4)$

5. idk... it said

log4 8

6. it was neither of those that you listed... i just tried it...

7. so the problem is :

(8)log4 = 3/2 ?

in exponential form this is the same as

(8) 10^(3/2) = 4 which is not true. 10^(3/2) is 31.6 and multiplied by 8 gives you a much bigger #. Maybe the answer key has a mistake?

8. Yes, I'm searching too, and I can't see any way to get 3/2...

9. hmmmmm... I have no idea..... I e-mailed my teacher and asker her, so, hopefully she can explain..... but, anyway, yeah, i have no idea....