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# AQA Core 4 - Monday 10th June 2013 (AM) - Official Thread watch

1. (Original post by PatrickM)
Ran out of time, hardest C4 paper ever. Honestly think it was harder than Jan 2013. What a ****ing joke.

I've been getting high 80/low 90s in practice papers. Even with grade boundaries I'm probably going to miss out on an A by a few marks. Absolutely livid - that exam was absolutely horrific in comparison to past papers. I'm pretty sure I dropped marks on nearly every single question.
Literally the same as you mate! In Jun11/12 I got 100 ums. Ill be shocked if I get 80
2. (Original post by onimusha370)
easiest paper ever, that means high grade boundaries
100UMS - 75
90UMS - 69
80UMS - 63
etc

very very easy, finished after 35 minutes and think i've got 74/75 at least.
what did everyone else think?
You're a nob
3. (Original post by bugsuper)
i got 11/3 ln2 + 2 but there seems to be some dispute over this

i thought if you integrated y=2 between 0 and -1, the area is just a rectangle of base 1 and height 2..., so positive 2
it doesn't go under the x-axis at any point

I probably sound like a total idiot
I also got +2.

The integral had 2x in it.

The limits were x=0 and x=-1, so the integral would be (2(0) + ...) - (2(-1) + ...)

= ... + 2
4. (Original post by fizzbizz)
UNOFFICIAL MARK SCHEME

1a) Partial fractions: A = 3, B = 1

1b) Integral =

1c) C = 2

1d)

2a) Show and hence find

2b)

2c)

3a) Binomial expansion:

3b)

3c) which gave (cannot remember to 6 d.p.)

4a) Show (2x + 3) is a factor of f(x)

4b)

4c) Show that function with and reduces to f(x) where

4d) Solve for theta:

has no solutions

5a) Parametric equations:

5b) Gradient of tangent was -4

5c) Co ordinates of P were (-2, 12)

When y = 0, x = -50 and therefore Q (which was the point it cuts the x axis) was (-50,0)

6a) Find vector AB (can't quite remember this)

6b) Vector line equation through AB

6c) Point D was at (5, 1, 2)

6d) For the two values of E I got

7) where and

8a) Indefinite integral:

By parts, this comes out to be:

8b) Differential equation (Courtesy of Nebula, post #600):

or

Do feel free to correct me! I feel I have missed some questions out too
1d. I think this may be +2 , not 100% sure
5. (Original post by fizzbizz)
UNOFFICIAL MARK SCHEME

1a) Partial fractions: A = 3, B = 1

1b) Integral =

1c) C = 2

1d)

2a) Show and hence find

2b)

2c)

3a) Binomial expansion:

3b)

3c) which gave (cannot remember to 6 d.p.)

4a) Show (2x + 3) is a factor of f(x)

4b)

4c) Show that function with and reduces to f(x) where

4d) Solve for theta:

has no solutions

5a) Parametric equations:

5b) Gradient of tangent was -4

5c) Co ordinates of P were (-2, 12)

When y = 0, x = -50 and therefore Q (which was the point it cuts the x axis) was (-50,0)

6a) Find vector AB (can't quite remember this)

6b) Vector line equation through AB

6c) Point D was at (5, 1, 2)

6d) For the two values of E I got

7) where and

8a) Indefinite integral:

By parts, this comes out to be:

8b) Differential equation (Courtesy of Nebula, post #600):

or

Do feel free to correct me! I feel I have missed some questions out too
I can deduce from this that I have almost certainly achieved less than 50%.... although I need 34% for an overall A. Gonna be tight! xD
6. (Original post by Qwob)
I also got +2.

The integral had 2x in it.

The integral would be (2(0) + ...) - (2(-1) + ...)

= ... + 2
Indeed. It was minus minus 2.

It's quite telling about exam nerves that I had to draw a little picture to justify minus minus 2 being positive 2 in my mind
7. Does there happen to be any legends out there who took pictures of the paper?
8. [QUOTE=fizzbizz;43070678]UNOFFICIAL MARK SCHEME

1d)

Wasnt it +2 because its 11/3ln2 - (-2)?
9. I got every single answer on the unofficial mark scheme besides the position vector of E. I got to the stage where I had a quadratic equation with 17u^2 I think it was. So hopefully I picked up 1/2 marks
I don't quite remember the signs of position vector of D but I remember mew=-1 and it involved (5,1,2) in that order.

Oh and for the sin(alpha) question I drew the triangle but I forgot to give a value for cos(alpha). But everything else seems legit. Confidence is sky high now
10. (Original post by Qwob)
Think I did too.

Happy looking at that mark scheme. I think I missed out the part where you had to find coordinates of Q unless I'm being an idiot and can't remember doing it. I didn't recheck that question though as I thought I'd done it right so I may have done it, but probably not. If I didn't look for the coordinate of Q would that be around 2 marks lost?
I think coordinate Q was 3 marks? I'm not too sure. Those marks shouldn't matter too much, don't worry.
11. Oh yeah and it was 11/2 ln2 + 2 because it was --2
12. (Original post by fizzbizz)
UNOFFICIAL MARK SCHEME

1a) Partial fractions: A = 3, B = 1

1b) Integral =

1c) C = 2

1d) EDIT: I may be wrong on this, since the integral gives which gives

2a) Show and hence find

2b)

2c)

3a) Binomial expansion:

3b)

3c) which gave (cannot remember to 6 d.p.)

4a) Show (2x + 3) is a factor of f(x)

4b)

4c) Show that function with and reduces to f(x) where

4d) Solve for theta:

has no solutions

5a) Parametric equations:

5b) Gradient of tangent was -4

5c) Co ordinates of P were (-2, 12)

When y = 0, x = -50 and therefore Q (which was the point it cuts the x axis) was (-50,0)

6a) Find vector AB (can't quite remember this)

6b) Vector line equation through AB

6c) Point D was at (5, 1, 2)

6d) For the two values of E I got

7) where and

8a) Indefinite integral:

By parts, this comes out to be:

8b) Differential equation (Courtesy of Nebula, post #600):

or

Do feel free to correct me! I feel I have missed some questions out too
you don't happen to do FP3 do you?
13. Can someone please explain how they get to the co-ordinates of D for Question 6c on the Vectors question?
14. [QUOTE=theslav;43070855]
(Original post by fizzbizz)
UNOFFICIAL MARK SCHEME

1d)

Wasnt it +2 because its 11/3ln2 - (-2)?

(Original post by bugsuper)
Indeed. It was minus minus 2.

It's quite telling about exam nerves that I had to draw a little picture to justify minus minus 2 being positive 2 in my mind

(Original post by DudeBoy)
1d. I think this may be +2 , not 100% sure

(Original post by Qwob)
I also got +2.

The integral had 2x in it.

The limits were x=0 and x=-1, so the integral would be (2(0) + ...) - (2(-1) + ...)

= ... + 2

(Original post by Student Number 4)
I also got 11/3 ln 2 + 2 and when I checked it on the calculator it was right, but someone who got 7/2 ln 2 +2 also said they checked it on the calculator and got it right?
My bad, I have updated the mark scheme!
15. (Original post by kesupile)
I got every single answer on the unofficial mark scheme besides the position vector of E. I got to the stage where I had a quadratic equation with 17u^2 I think it was. So hopefully I picked up 1/2 marks
I don't quite remember the signs of position vector of D but I remember mew=-1 and it involved (5,1,2) in that order.

Oh and for the sin(alpha) question I drew the triangle but I forgot to give a value for cos(alpha). But everything else seems legit. Confidence is sky high now
16. Oh no

Posted from TSR Mobile
17. I'm basically guessing here, but wasn't the vector AB (-2, -3, 2) or something like that?
Just trying to fill in the gaps
18. (Original post by kesupile)
I got every single answer on the unofficial mark scheme besides the position vector of E. I got to the stage where I had a quadratic equation with 17u^2 I think it was. So hopefully I picked up 1/2 marks
I don't quite remember the signs of position vector of D but I remember mew=-1 and it involved (5,1,2) in that order.

Oh and for the sin(alpha) question I drew the triangle but I forgot to give a value for cos(alpha). But everything else seems legit. Confidence is sky high now
We seem to have done exactly the same on everything. That is scary.

I got the quadratic containing 17u^2 and just solved it on my calculator, knowing it was wrong.
19. Barely attempted Q7, it seemed really misleading in my eyes, I think I just had a mental retard attack half way through the exam
20. can anyone remember the number of marks for each question?

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