# OCR (Not MEI) C2 January 2013 DiscussionWatch

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6 years ago
#101
(Original post by abzy1234)
How on earth do you work out the value of x in question 6? I applied the formula un= a + (n-1)d to the terms 2x and the second one. Then I did the same for the third and second terms; and could not get any further.

Also, question 9, when integrating, how on earth did they get a cubic value?

I've looked through the past papers, and there's surely not a difficult paper like today compared to the others.
for no. 9 when you intergrate and everything you get something like:
aX^2 + bX + c/x = 0
It was important to spot that it equalled to 0, because this mean you could multiply both sides by 'X' hence giving a cubic I just about managed to spot it myself
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6 years ago
#102
And it definitely said a was positive? Damn it!
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6 years ago
#103
(Original post by mossss)
anyone remember any of the questions?
I'll post what I remember (for definite)

4i) Expand (2 + x)5

ii) Hence find the coefficient of y3 in the expansion of (2 + 3y + y2)5

? (something along the lines of) A horizontal line is drawn through the curves y=log2 x and y=log2 (x-3). It crosses y=log2 x at P and y=log2 (x-3) at Q. The x coordinates of P and Q is the same, c, and the distance PQ is 4. Find c.
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6 years ago
#104
What did anyone get for the value of k?
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#105
(Original post by BawanHama)
for no. 9 when you intergrate and everything you get something like:
aX^2 + bX + c/x = 0
It was important to spot that it equalled to 0, because this mean you could multiply both sides by 'X' hence giving a cubic I just about managed to spot it myself

Ahh I get it now! Thanks! So so so subtle. I bet these examiners can see through ice
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6 years ago
#106
(Original post by BawanHama)
for no. 9 when you intergrate and everything you get something like:
aX^2 + bX + c/x = 0
It was important to spot that it equalled to 0, because this mean you could multiply both sides by 'X' hence giving a cubic I just about managed to spot it myself
Correct. You ended up with something along the lines of 3x2 + ax + 8/2x = 0 I think, and so you could multiply everything by x to get the cubic!

And if anyone is confused, the question used a's whereas I just used x's if that reminds you of which one it was!
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6 years ago
#107
(Original post by Luppy021)

Cant have the log of a negative number, I got 3.2
I got 3.2 as well .
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6 years ago
#108
(Original post by KRJACK)
What did anyone get for the value of k?
9 over 10 but I'm pretty sure im wrong
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6 years ago
#109
(Original post by olivers16)
9 over 10 but I'm pretty sure im wrong
not to be mean but i really hope you're wrong i didn't get that
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6 years ago
#110
If u all want the answers then contribute Qs if you can remember them and Mr M will post the answers
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6 years ago
#111
(Original post by FootInMouth)
If u all want the answers then contribute Qs if you can remember them and Mr M will post the answers

Is there any way to tag a member?

Here's what I remember for sure:

4i) Expand (2 + x)5

ii) Hence find the coefficient of y3 in the expansion of (2 + 3y + y2)5

? (something along the lines of) A horizontal line is drawn through the curves y=log2 x and y=log2 (x-3). It crosses y=log2 x at P and y=log2 (x-3) at Q. The x coordinates of P and Q is the same, c, and the distance PQ is 4. Find c.
0
6 years ago
#112
(Original post by stirkee)
Is there any way to tag a member?

Here's what I remember for sure:

4i) Expand (2 + x)5

ii) Hence find the coefficient of y3 in the expansion of (2 + 3y + y2)5

? (something along the lines of) A horizontal line is drawn through the curves y=log2 x and y=log2 (x-3). It crosses y=log2 x at P and y=log2 (x-3) at Q. The x coordinates of P and Q is the same, c, and the distance PQ is 4. Find c.

There was a question asking what transformation maps log2x onto log2(x-3)

log2x has co-ordinates (a , something). Find a.

log2(x-3) has co-ordinates (something, b) Find b.
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6 years ago
#113
(Original post by FootInMouth)
If nobody has the paper we need to try and create a copy of the questions
The question with the tangents i remember it:

I'll draw a diagram on fireworks and upload it for you all

the question was (not exactly worded correctly but I these were the questions with the allocated marks):

5) The radius of two circle (from points A and B) have a radius of 7 cm. The radi meet at point C. The distance between A and B is 12 cm.

i) Show that the angle CAB is 0.5411 radians (2 marks)
ii) find the perimeter of the shaded region (2 marks)
iii) find the area of the shaded region (5 marks)
5
6 years ago
#114
(Original post by saberahmed786)
The question with the tangents i remember it:

I'll draw a diagram on fireworks and upload it for you all

the question was (not exactly worded correctly but I these were the questions with the allocated marks):

5) The radius of two circle (from points A and B) have a radius of 7 cm. The radi meet at point C. The distance between A and B is 12 cm.

i) Show that the angle CAB is 0.5411 radians (2 marks)
ii) find the perimeter of the shaded region (2 marks)
iii) find the area of the shaded region (5 marks)
Yeah that's right, well remembered
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6 years ago
#115
(Original post by Ranibizumab)
There was a question asking what transformation maps log2x onto log2(x-3)

log2x has co-ordinates (a , something). Find a.

log2(x-3) has co-ordinates (something, b) Find b.
Ah yeah of course. Can you remember which Q this was?

Something is telling me it was Q6 but I'm not sure.
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6 years ago
#116
I think the last question started with the 2a and a with 2x^.......5x^3+4 all over x^2 and you were asked to make it show t = .......+2, sorry, all I remember, hopefully someone can fill in the blanks.
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6 years ago
#117
There was one something like, log2a=3 find value of a
0
6 years ago
#118
one of the guys in my fmaths class missed out 4 questions entirely on the paper

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6 years ago
#119
I was really confident before this exam and now I feel awful, but here's what I remember from it

I can't remember all, but..

Q.4 I think was the binomal expansion but I'm not sure..
Q.6 was the whole u1=2x, u2=x+4, u3=2x-7
Q.7 was the cirlcles and shaded area question
Q.8 was the logs (remember the log graph on the back page?)
Q.9 was the integrating between 2a and a

here's to an easier re-sit in june
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6 years ago
#120

Not sure if this has already been uploaded but I brought my exam paper out with me. You're welcome
8
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