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From: Stephen Montgomery-Smith on 8 May 2010 12:35
karl wrote:
> Albert schrieb:
>> karl wrote:
>>> Albert schrieb:
>>>> f'(x) = (x ^ 3) * e ^ x.
>>> What is this, the derivative of f(x)? If you think this, read in your textbook about the product rule for
>>> differentiating functions.
>>
>> Yes, that is such a poor mistake I made.
>>
>> f'(x) = xe^x(2 + x)
>
> I said, read in your textbook about the product rule.

What's wrong with Albert's second answer? He even expanded and then
factored it correctly.
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