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Math Help - Expanding and simplifying quotients

  1. #1
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    Expanding and simplifying quotients

    Expand and simplify the following quotient then evaluate for a=-3 and h=0.01.

    1. (a+h)^3 - a^3 / h

    I did

    a^3 + 2ah + h^3 - a^3 / h

    2ah+h^3 /h

    2a+h^2
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  2. #2
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     <br />
(a+h)^3 = a^3+3a^2h+3ah^2+h^3<br />
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  3. #3
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    I dont know where the 3a^2h + 3ah^2 come from....
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  4. #4
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    (a+h)^3 = (a+h)(a+h)(a+h) = (a+h)(a^2+2ah+h^2) = a^3+3a^2h+3ah^2+h^3
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