1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Exponential Funcitons

  1. Jun 22, 2004 #1
    I have no idea how to do this problem or where to even start: Find the exponential function f(x) = Ca^x who’s graph is given. The graph has a concave up line, that intersects the y-axis at what looks like ½ (no exact intersection is given) and has the two points (1,6) and (3,24).
  2. jcsd
  3. Jun 22, 2004 #2
    That the point (1, 6) lies on the graph means that f(1) = 6. But f(x) = Ca^x, so f(1) = Ca^1 = Ca = 6. You can find a similar equation using the other point. You now have two equations and two unknowns. Can you take it from there?
  4. Jun 23, 2004 #3


    User Avatar
    Staff Emeritus
    Science Advisor

    However, the graph of y= Cax, passing through (1,6) and (3,24) doesn't cross the y-axis anywhere near 1/2!
  5. Jun 23, 2004 #4


    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    It crosses at y=3/2.
  6. Jun 23, 2004 #5
    That helps a lot, thank you. Sorry about the ½ thing, didn’t do a very good job of eyeballing it.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Exponential Funcitons
  1. Integrating exponential (Replies: 21)

  2. Exponential integral (Replies: 0)

  3. Exponential Identities (Replies: 2)