Vane11
  • Vane11
Anyone with a scientific or graphing calculator plz help! I don't have the appropriate calculator, could someone find log(-.39) and ln(-.39) ?? you have to press the inverse button
Mathematics
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SOLVED
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katieb
  • katieb
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Psymon
  • Psymon
Uh, log and ln of anything negative is undefined.
Vane11
  • Vane11
that's why you have to use inverse
Psymon
  • Psymon
What is there to inverse? O.o If you only give me an expression of ln(-.39), I dont see what can be done.

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Vane11
  • Vane11
well its actually .39=logx and .39=lnx my bad but I still don't have a calc
Psymon
  • Psymon
Now thats infinitely different, lol.
Vane11
  • Vane11
yup Im out of it sorry
Psymon
  • Psymon
Well, do you know what youd normally have to do if you had a calculator?I have no problem doing the calculator work, just need to make sure you would know whats going on.
Vane11
  • Vane11
well would it be 10 to the power of the number? in this case .39? im looking at some notes and it shows logx=5 and they go on to do 10^5 and get the big ol number
Psymon
  • Psymon
Yeah. Because when logx is written with no base, the base is assumed to be 10. So you would have 10^.39 = x, right. And for the ln portion?
Vane11
  • Vane11
idk bout that one I don't get what the notes are saying....
Vane11
  • Vane11
wait I think I got it
Psymon
  • Psymon
Well, if its ln, you "e" both sides.
Psymon
  • Psymon
So for log(x) = .39, we change it into 10^.39 = x for ln(x) = .39, we e both sides and have x = e^.39
Vane11
  • Vane11
i used an online calc and got the answers :)
Psymon
  • Psymon
Alright xD But yeah, knowing what is actually going on is still important.
Vane11
  • Vane11
yeah, I got it a lil bit before you responded again but th website is lagging on my comp for some reason... thanks though!
Psymon
  • Psymon
Yeah, np :3
anonymous
  • anonymous
inverse of lnx is e^x

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