C2 AQA June 2013 Q5

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On 5b i can't see why you need to suddenly put the 8x^3 into brackets? can you not get the answer without the bracket? thanks 

sambrook
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On 5b, I thought that the f(ax) stretches y=f(x) by a scale factor of 1/a. Why is the scale factor 2 not 1/2?
Many thanks! :)

joliag