Results 1 to 3 of 3

Math Help - Question on exponents

  1. #1
    Newbie
    Joined
    Sep 2008
    Posts
    17

    Question on exponents

    For the problem (3/(5-x))^5 Do you FOIL the bottom, or do you distribute the exponent?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Super Member
    Joined
    Jun 2008
    Posts
    792
    \left(\frac{a}{b}\right)^n = \frac{a^n}{b^n}

    If you really needed to expand the denominator, then use the bionomial theorem:
    (x+y)^n = \sum^{n}_{k=0}\left( \begin{array}{c} {n} \\ {k}\end{array}\right) x^{n-k}y^k
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Super Member 11rdc11's Avatar
    Joined
    Jul 2007
    From
    New Orleans
    Posts
    894
    \bigg(\frac{3}{5-x}\bigg)^5

    You would foil out the bottom

    \frac{243}{(5-x)^5}

    But the fastest way would be binomial theorem
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Exponents question
    Posted in the Algebra Forum
    Replies: 6
    Last Post: May 7th 2011, 12:17 PM
  2. Quick question about exponents
    Posted in the Calculus Forum
    Replies: 2
    Last Post: July 29th 2010, 08:16 AM
  3. Basic Exponents question
    Posted in the Algebra Forum
    Replies: 1
    Last Post: August 1st 2009, 10:53 AM
  4. Easy Question (exponents)
    Posted in the Math Topics Forum
    Replies: 3
    Last Post: February 3rd 2009, 02:49 PM
  5. Exponents question
    Posted in the Algebra Forum
    Replies: 1
    Last Post: January 11th 2009, 08:52 PM

Search Tags


/mathhelpforum @mathhelpforum