1. Limited time only! Sign up for a free 30min personal 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!

Homework Help: Negative Fractional Exponent problem

  1. May 29, 2012 #1
    Hi All,

    Can anyone walk me through this problem. This is from an old med school entry test.

    The answer is 81 but I can't work out how the x terms cancel.

    3x(3x^ -1/3)^3

    Thanks in advance

  2. jcsd
  3. May 29, 2012 #2

    Given of course that x is not 0.
  4. May 29, 2012 #3
    Hi Meldraft,

    It looks so simple I don't know why I didn't do it that way. Thanks very much.

  5. May 29, 2012 #4
    It's very easy to put that 3^3 in the denominator by accident :wink:
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook