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July 22nd, 2017, 05:11 PM  #1 
Newbie Joined: Jul 2017 From: Meridian, ID Posts: 7 Thanks: 0  Log with negative exponent on TI84 Plus Calculator
Good evening to all  I have what may be a very basic (Newbie) sort of question ... I have a TI84 Plus calculator, and I don't understand how to enter a log raised to the 1 power, on the calculator keypad ... An example of the formula I need to solve on the calculator is: 50 x Log1(0.1) Note that the "Log1" is actually supposed to be Log raised to the 1 power (Not sure how to make the 1 appear as an exponent of the word Log  lol) Thanks in advance, for any suggestions ! 
July 22nd, 2017, 05:18 PM  #2 
Math Team Joined: Jul 2011 From: Texas Posts: 2,836 Thanks: 1478 
depends on where you place the negative one ...

July 22nd, 2017, 05:21 PM  #3 
Senior Member Joined: May 2016 From: USA Posts: 1,310 Thanks: 550 
I know nothing about your calculator, but if what you want to compute is $\log_a \left ( x^{1} \right )$ you can do so with $\log_a(x)$. If what you want to compute is $\{\log_a(x)\}^{1}$ you can do so with $\dfrac{1}{\log_a(x)}$. Last edited by skipjack; July 23rd, 2017 at 04:26 AM. 
July 22nd, 2017, 05:36 PM  #4 
Newbie Joined: Jul 2017 From: Meridian, ID Posts: 7 Thanks: 0  Yes, that's the problem it is actually written as the word Log with the 1 exponent immediately after the word Log .... So it is Log to the 1 power ... and that is then multiplied by another number (I wish I could paste an image of the formula on here, so you could see it). *** Just like this formula, except that the 1 is an exponent (Log raised to the 1 power): log1(x+3) Last edited by Angus; July 22nd, 2017 at 05:41 PM. 
July 22nd, 2017, 05:47 PM  #5  
Math Team Joined: Jul 2011 From: Texas Posts: 2,836 Thanks: 1478  Quote:
note this will yield an imaginary result ... you sure the $0.1$ in parentheses is negative?  
July 22nd, 2017, 06:10 PM  #6  
Math Team Joined: Jul 2011 From: Texas Posts: 2,836 Thanks: 1478  Quote:
now ... what are you trying to make the calculator do?  
July 22nd, 2017, 06:14 PM  #7  
Newbie Joined: Jul 2017 From: Meridian, ID Posts: 7 Thanks: 0  Quote:
Here is an image of the formula  http://mymathforum.com/attachment.ph...1&d=1500775993 Thanks Skeeter  I think we are getting close to a solution to my dilemma. I attached images so you can see the entire formula  Yes the 0.1 is actually negative. As mentioned, the only thing I'm struggling with is how to enter the Log raised to the 1 power, on the calculator keys. Last edited by Angus; July 22nd, 2017 at 06:19 PM.  
July 22nd, 2017, 06:30 PM  #8 
Math Team Joined: Jul 2011 From: Texas Posts: 2,836 Thanks: 1478 
your text is using $\log^{1}(0.1)$ as an inverse log notation, that is ... $\log^{1}(0.1) = 10^{0.1} = 0.7943...$ 
July 23rd, 2017, 03:49 AM  #9 
Newbie Joined: Jul 2017 From: Meridian, ID Posts: 7 Thanks: 0 
Thanks Skeeter (and others who helped). I have rarely ever worked with Logs, and did not understand that this was an inverse Log function. I think I can do these problems now  Thanks again for the kind assistance ! 
July 23rd, 2017, 04:07 AM  #10 
Math Team Joined: Jul 2011 From: Texas Posts: 2,836 Thanks: 1478 
fyi, inverse log used to be written antilog(whatever) in the old days of log tables. To be honest, it's been a while since I've seen the negative one inverse notation used with logarithms ... kind of rare, actually. 

Tags 
calculator, exponent, log, negative, ti84 
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