Results 1 to 2 of 2

Math Help - Simplifying expressions involving exponents

  1. #1
    Newbie
    Joined
    Nov 2008
    Posts
    1

    Question Simplifying expressions involving exponents

    The first question is
    1. Simplify without negative exponents
    -7x^-2
    Now doing this one I had trouble, the answer I came up with was 1/7x^2

    2. Simplyfy without negative exponents
    x^-7/x^2
    This was my reasoning x^-7+2=x^-5=1/x^5
    I guess I got it wrong though?

    3. Simplify using positive exponents
    (-4v^7/3)(2v^-1/3)
    I did (-4)(2) (v^7/3+-1/3)= -8v

    4. Simplify using positive exponents
    3x^2/3/7x
    I got 3/7x^1/3

    Please help ASAP
    Can anyone at least help with one?
    Last edited by cyn012588; November 6th 2008 at 05:05 PM. Reason: Can anyone at least help with one?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    skeeter's Avatar
    Joined
    Jun 2008
    From
    North Texas
    Posts
    12,130
    Thanks
    1012
    -7x^{-2} = -\frac{7}{x^2}

    \frac{x^{-7}}{x^2} = (x^{-7})(x^{-2}) = x^{-9} = \frac{1}{x^9}

             (-4v^{\frac{7}{3}})(2v^{-\frac{1}{3}}) = 8v^{\frac{7}{3} - \frac{1}{3}} = -8v^{\frac{6}{3}} = -8v^2

    not sure about this last one ... you really need to use some grouping symbols so one can understand your syntax.

    \frac{3x^{\frac{2}{3}}}{7x} = \frac{3}{7}x^{-\frac{1}{3}} = \frac{3}{7x^{\frac{1}{3}}}
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Simplifying Expressions with Integral Exponents
    Posted in the Pre-Calculus Forum
    Replies: 3
    Last Post: September 2nd 2009, 08:38 AM
  2. Roots to exponents, self created expressions
    Posted in the Algebra Forum
    Replies: 2
    Last Post: June 13th 2009, 05:59 PM
  3. radical expressions/exponents.
    Posted in the Algebra Forum
    Replies: 2
    Last Post: May 15th 2008, 05:18 AM
  4. Replies: 3
    Last Post: April 20th 2008, 06:25 PM
  5. Simplifying Expressions/Exponents
    Posted in the Algebra Forum
    Replies: 1
    Last Post: September 13th 2007, 10:59 PM

Search Tags


/mathhelpforum @mathhelpforum