Which question in particular? What work have you done thus far?
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Hopefully one of those worked, just stuck on how to work question (2b) out, can't see a solution beyond something involving dominant powers. Thanks.
Question 2b involving calculating f'(x), I haven't been able to do much because all my research hasn't come across a question like that.
I appreciate it appears that I'm just looking for someone to answer it for me but studying for an exam has led me to asking for help.