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Math Help - Simplifying with Positive Exponents

  1. #1
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    Simplifying with Positive Exponents [SOLVED]

    Simplify with Positive Exponents:

    (2x-2b4)-2

    I know the correct answer is \frac{x^4}{4b^8}

    but for some reason I keep getting a totally different answer. Which is:

    \frac{2x}{b^4}

    I am following the rules of the exponents but maybe I am making a simple mistake somewhere? Can someone explain to me how to get the correct answer? Thank you!

    Edit: I figured out what I was doing wrong!


    (2x-2b4)-2

    -4x4b-8

    \frac{x^4}{4b^8}

    I didn't distributed the -2 properly.
    Last edited by michellederz; September 17th 2013 at 10:01 AM.
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  2. #2
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    Re: Simplifying with Positive Exponents

    Quote Originally Posted by michellederz View Post
    Simplify with Positive Exponents:
    (2x-2b4)-2
    \left(2x^{-2}b^4\right)^{-2}=\left(2\right)^{-2}\left(x^{-2}\right)^{-2}\left(b^4\right)^{-2}=\left(\frac{x^4}{4b^8}\right)
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