Maths AQA C1 revision - 14th January 2013

i think i got more than 45 marks whats that

Was there any integration at all ? I didn't spot any. There was one question were it gave the differentiated form of dy/dx and it said find the equation of it. Do you put it in the form of "y=......ect.." you know when you get the curve of the equation then you differentiate to get dy/dx please tell me this is right, you do the opposite don't you ? tell me if u dont understand my concern

you integrate dy/dx and got something like 2x^5-2x^3+5x+C
=>y=2x^5-2x^3+5x+c
=>solve for C e.g C=-2x^5+2x^3-5x-y
=>you should've got c=-1
=>y=2x^5-2x^3+5x-1


(the signs might be wrong but im 100% certain of the -1 at the end)

I did that but I didnt put C and C=-1 Woop defo got some there then huh Cus I differentiated it back and wrote "Hence, dy/dx = 10x^4 - 6x^2 + 5

Was there any integration at all ? I didn't spot any. There was one question were it gave the differentiated form of dy/dx and it said find the equation of it. Do you put it in the form of "y=......ect.." you know when you get the curve of the equation then you differentiate to get dy/dx please tell me this is right, you do the opposite don't you ? tell me if u dont understand my concern

Considering most people found it easy Id say
75(MAX) - 61(A) 55(B) 49(C) 43(D) 37(E)

Last year was 58 for an A.
I think this year is 65.

Did people draw this for the graph of x squared +6x+11 with vertex (3,2)

It was a coded intergration.
You were given the f'(x) of a function.
And from that we have to work out the rate of change?

Then it tells you to work out the equation of the curve.
You intergrate it, BUT it's 5 marks so you have to work out +C by subsituating the points of P (1,4)??? Into the equation to get -1 as C

I'm a little bit unsure about your case mate. Here's the thing by writing y=......+C
C=-1 you are correct and would get all 5 marks for that. Although these kind of questions have that "take the last line as the answer" so you may drop the marks if your last line isn't y=.......+c C=-1 or y=.......-1

I didn't show any working out I just put the correct answer excluding c= -1 as u say do u think I would've still gotten some marks

Did people draw this for the graph of x squared +6x+11 with vertex (3,2)

Hopefully if this question was excluded from 'Consider the last line their answer' then you would get all 5 marks.
But it is highly likely that the last line will be considered your answer so if your last line isn't y=.........+c c=-1
then you may be looking at around 3 marks