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**Problem with factorising**

Hi, the question is to differentiate the following equation with respect to x.

x^4(3x-1)^3

Using the product rule i think i'v partially completed this to

x^4(3(3x-1)^2) + (3x-1)^3(4x^3)

I'm now required to simplify this - which leaves me completely stumped. There is an answer in the back of the book which i simply cannot get to, could i please hear some of your solutions to this!

James

Edit:Wrong title

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