calculus

5. If f (x)=(2x+1)^4 then the 4th derivative of f(x)=0 at x = 0 is..

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asked by Yoona
  1. f'=4( )^3 * 2
    f"=12 ( )^2 * 2
    f'''=24 ( )*2
    f""=24*4

    So I don't know what your question is, but fourth derivative is not zero.

  2. I think you lost the 2's along the way
    f'=4( )^3 * 2
    f"=24 ( )^2 * 2
    f"'=96 ( )*2
    f""=192*2 = 384 (= 24*2^4)

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    posted by Steve

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