FP1 Divisibility Result

I'm not sure if I have done this correctly and I don't have the mark scheme. Could somebody verify if this is correct or not? Thanks.



I hope the picture works. Thanks


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This was my exam.

That's perfect and full marks.

Your final line could have been $f(k+1) = 4f(k) + 21(\cdots)$ i.e: instead of writing the f(k) when you add it to both sides as 21m, just add it to the existing f(k). But what you've written would garner full marks.

Great! Unfortunately I have not scored 75/75 on this paper though . I could not follow through a question about a triangle being 3 times larger than another triangle. But apart from that it went ok. How would you compare this paper to previous years and what do you think the June edition will be like ?


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Great! Unfortunately I have not scored 75/75 on this paper though . I could not follow through a question about a triangle being 3 times larger than another triangle. But apart from that it went ok. How would you compare this paper to previous years and what do you think the June edition will be like ?


Posted from TSR Mobile

C.

Good luck if you have any exams in June!

Thank you! (and yeah, I've got a fair few of them coming up). Good luck to you as well!

Just making sure you saw my link to the model answers above?

It would have been easier to do $f(k+1)-4f(k)$ the result falls right out. You could even do $f(k+1)-25f(k)$ if you really wanted to just to make either the 4^ or 5^ terms cancel.

Thanks for responding, how do you know when to use this though?


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