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3.4 – Exponential & Logarithmic Equations

Feb 22nd, 2011 by

Hello,

Please use this page to post questions related to Chapter 3, Section 4.

Happy blogging,
Mrs. Corricelli

4 Responses to “3.4 – Exponential & Logarithmic Equations”

  1. Nick Miceli says:
    March 6, 2011 at 5:26 pm

    For the homework of finding an exponential data set, should this be for a real-life example exhibiting exponential growth, decay, or either one?

    Reply
  2. corricelli says:
    March 7, 2011 at 8:09 am

    Hello Nick –

    Either is fine.

    Thanks,
    Mrs. Corricelli

    Reply
  3. Evan FH says:
    March 7, 2011 at 9:44 pm

    The equation that excel gave me looks like this:
    f(x)= 2E-38e^0.0516x
    However, I have no idea what E is. Is it just e, but uppercase? that didn’t seem right especially when I plugged it into my calculator. Thank you!

    Reply
  4. corricelli says:
    March 7, 2011 at 10:41 pm

    Hello Evan,

    This is a common issue.
    2E-38 here, is just like in the calculator – it means 2 times 10 to the -38 or, symbolically: 2 * 10^(-38).

    A few options – usually this means your x-data is FAR away from the y-axis. Excel is struggling to fit an exponential curve just above zero… Soooo you could change your data to be closer to the y-axis. Some people accomplished this by (for years for example) saying x= “Years After 1950″ if the first year was 1955…

    You can change the title and the data and the graph in excel (and the equation) will change in real time.

    Hope this helps!

    Mrs. Corricelli

    Reply

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