AQA C3 June 2014 Unofficial Mark Scheme

im sure its not because ive went back to the textbook to check and its reflected in the y axis only

im sure its not because ive went back to the textbook to check and its reflected in the y axis only

To get an A* is it 90 ums in each c3 and c4 or average ovet c3 and c4? Aka can I save this on Thursday ������

It was 0^(1/2)*sin(0). 0*0=0

ugh, lost at least 7 marks on question 4 alone, there goes my a*... probably around 62/75 overall. :/ Is this likely to be an A? I need to know whether i can still get an a* in maths overall, i.e. whether i should bother for c4, because i'm guaranteed an A already so if I can't get a*, no point trying c4.

OHHHH my god, no I completely understand now! Sorry, I am so bloody dim when it comes to modulus graphs You're right!

They were supposed to look like this. Although I just found out I did the second one wrong in the exam

Yes i used to wrong ordinates... Kicking myself for some of the mistakes i made... Who the hell thinks 9am is a good time for an exam.

They were supposed to look like this. Although I just found out I did the second one wrong in the exam

Thanks, the second one I did not do a reflection but graph looks very similar I just reflected the part below the x-axis above the x-axis. It does not look like a reflection to scale but can look like one due to the nature of the graph lol.

Do you reckon I will get it?

Also how many marks lost for wrong co-ordinates?

For 4)c) i - Can you not do Translation (-2,0) followed by stretch parallel to x axis by SF 1/2 ? Will that get all the marks?

I don't know what you're describing but my picture is wrong. It is supposed to be a reflection of the positive x values. I can't really describe it haha. And it was only worth two marks, so one for the shape and one for the coordinates I'd assume

Yepp that's right, I did it that way. There were two ways and it didn't matter which one

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exactly the same situation as me i only needed C's/D's in c3 or c4 to get an A if i don't get 90% but it looks like i've got 63/75 so i might just give up on c4

For 4c i thought the translation comes first, followed by the stretch? Could somebody please explain why for the last Q8 question why you don't add 2 to the values? Also for integration by parts why is it not sin? As I thought you integrate sin to -cos then do it again so -cos to -sin?

It's so annoying to put so much effort in over the two years, perform consistently in the high 90's, and then fall down a slight bit in one exam. It's annoying too because I'm actually a lot better at C4, as I find the questions a lot more conceptual than C3 and the grade boundaries are lower meaning i don't drop down grades for silly errors. Eh well. F it.