Posted by **Yoona** on Sunday, February 12, 2012 at 11:19am.

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

- calculus -
**bobpursley**, Sunday, February 12, 2012 at 11:27am
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.

- calculus -
**Steve**, Sunday, February 12, 2012 at 5:03pm
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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