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Math Help - How to simplify this?

  1. #1
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    How to simplify this?

    Hi there, havn't done math in a while and I switched back to an advanced course so im a little behind.

    The question asks me to simplify

    I get this: = =

    It just doesn't feel right though, can you show me where I went wrong?
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  2. #2
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    Re: How to simplify this?

    $(x^a)^b = x^{ab}$ NOT $x^{a+b}$ as you've done.

    $\dfrac{(3x^4 y^5 z^7)^5}{(-3x^3 y z^4)^7}=$

    $\dfrac {3^5 x^{20} y^{25} z^{35}}{(-3)^7 x^{21} y^7 z^{28}}=$

    $\dfrac {3^5 y^{18} z^7}{(-1)^7 (3)^7 x} =$

    $-\dfrac{y^{18}z^7}{9x}$
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  3. #3
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    Re: How to simplify this?

    thank you for clearing that up
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