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Mathematics: Post your doubts here!

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Ok. I have done so and after I substitute (x + 3x^2), my answer is:

405 x^8

But the marking scheme's answer is 675 x^8. Why are they adding the above answer to the answer in part (ii)?
 
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Awesome12 we add the 270 because it represents the coefficient of x^8
for expansion in part (iii) the expansion isnt complete i mean not all x^8 r included.
so u take the one from part (ii) also
 
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Thanks again. BTW, I did my AS level in May/June 2014 session and scored "a". Based on what I calculated, the minimum score I got is 110. But I was just wondering what are my chances of scoring A* in A levels.
My school said if you get an A grade in As level maths, and if you maintain that A in your A level, then your A grade in A level and As level will become an overall A* so yeah you have a good chance :)
 
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