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Math Help - Help!!! Distributive property with exponents

  1. September 17th 2008, 08:35 PM #1
    coquettish6836
    coquettish6836 is offline
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    Exclamation Help!!! Distributive property with exponents

    use the distributive property to expand these expressions. leave ur answer in exponential form.

    7^7(7^9 +7^4) = __________

    6k^2(3k^4 - 9k^8) = _________


    these are 2 of like 100 i have, i just want to make sure im doing them right so i dont have to redo them later, and well fail the assignment.
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  2. September 18th 2008, 12:09 AM #2
    Pn0yS0ld13r
    Pn0yS0ld13r is offline
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    Remember the product of powers property of exponents: a^{m} \cdot a^{n} = a^{m+n}.

    I'll do the first one.

    1)

    7^{7}\left(7^{9}+7^{4}\right) = 7^{7} \cdot 7^{9} + 7^{7} \cdot 7^{4} = 7^{7+9} + 7^{7+4} = 7^{16} + 7^{11}.
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