Results 1 to 2 of 2

Math Help - Graphing an exponential function

  1. #1
    Newbie
    Joined
    Aug 2008
    Posts
    19

    Graphing an exponential function

    Hello, I need to graph g(x)= -2^x using x values -2,-1,0,1,2 and find all asymptotes. I was under the impression that an exponential function with base b is defined as follows: f(x)=b^x Where b is greater than 0, b cannot =1, and x is any real #......if this is true, -2 is NOT greater than 0, hence my confusion. I plotted the given points but they don't seem to form a normal looking exponential function graph. I also can't seem to figure out where the asymptotes fall from the points I've plotted. Any insight on this would be most helpful, Thanks ~CC
    Follow Math Help Forum on Facebook and Google+

  2. #2
    o_O
    o_O is offline
    Primero Espada
    o_O's Avatar
    Joined
    Mar 2008
    From
    Canada
    Posts
    1,407
    I think you're graphing y = (-2)^x instead of y = -2^x. There is a big difference.

    For example, if we take x = 2, we have:
    (-2)^4 = 16 but -2^2 = -2 \cdot 2 \cdot 2 \cdot 2 = -(2^4) = -16

    For the former graph, you will get a bunch of scattered points that don't form a smooth curve. However, the latter graph produces y = 2^x but reflected over the x-axis.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 2
    Last Post: April 17th 2012, 11:50 AM
  2. Exponential functions and graphing them.
    Posted in the Pre-Calculus Forum
    Replies: 9
    Last Post: September 22nd 2009, 09:40 AM
  3. Replies: 0
    Last Post: August 31st 2009, 03:02 AM
  4. Graphing exponential functions
    Posted in the Pre-Calculus Forum
    Replies: 1
    Last Post: November 14th 2007, 06:45 PM
  5. graphing exponential functions
    Posted in the Calculus Forum
    Replies: 1
    Last Post: January 8th 2007, 09:30 AM

Search Tags


/mathhelpforum @mathhelpforum