My Math Forum What is f(x)=5^(x-1)?

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 June 20th, 2017, 07:38 PM #1 Senior Member   Joined: Aug 2014 From: Mars Posts: 101 Thanks: 9 What is f(x)=5^(x-1)? I saw this on a test, but can't remember what it was referring to. I've been on Khan Academy and can't find an explanation. $f(x)=5^{x-1}$ I chose $f(0)$ Last edited by skipjack; June 21st, 2017 at 07:33 AM.
 June 20th, 2017, 09:02 PM #2 Math Team   Joined: Jul 2011 From: Texas Posts: 2,656 Thanks: 1327 You're not giving much to go on here ... fyi, $f(0)=\dfrac{1}{5}$ Thanks from topsquark and Joppy
 June 20th, 2017, 11:02 PM #3 Global Moderator   Joined: Dec 2006 Posts: 18,140 Thanks: 1415 Was it a Khan Academy test?
 June 21st, 2017, 05:46 AM #4 Senior Member   Joined: Aug 2014 From: Mars Posts: 101 Thanks: 9 No, it was an accuplacer. It's taken me a little while to realize it, but the whole test is covering algebra II which I have never taken. The practice tests are in no way representative of what is on the actual tests. But I'm 3 points away from getting into the class I need, so I'm studying as much as I can. Why does $f(0)=\dfrac{1}{5}$ ?
 June 21st, 2017, 07:14 AM #5 Senior Member   Joined: Aug 2014 From: Mars Posts: 101 Thanks: 9 I get it $5^{-1}=\dfrac{1}{5}$ Didn't even see the setup.
 June 22nd, 2017, 04:51 AM #6 Math Team   Joined: Jan 2015 From: Alabama Posts: 2,820 Thanks: 750 I don't understand why Opposite "chose f(0)"! What was the question? Thanks from topsquark

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