# OCR (Not MEI) C2 January 2013 Discussion Watch

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#101

(Original post by

How on earth do you work out the value of x in question 6? I applied the formula u

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.

**abzy1234**)How on earth do you work out the value of x in question 6? I applied the formula u

_{n}= 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.

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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#103

(Original post by

anyone remember any of the questions?

**mossss**)anyone remember any of the questions?

4i) Expand (2 + x)

^{5}

ii) Hence find the coefficient of y

^{3}in the expansion of (2 + 3y + y

^{2})

^{5 }? (something along the lines of) A horizontal line is drawn through the curves y=log

_{2 }x and y=log

_{2 }(x-3). It crosses y=log

_{2 }x at P and y=log

_{2 }(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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(Original post by

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

**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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#106

**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

^{2 }+ 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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#108

(Original post by

What did anyone get for the value of k?

**KRJACK**)What did anyone get for the value of k?

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#109

(Original post by

9 over 10 but I'm pretty sure im wrong

**olivers16**)9 over 10 but I'm pretty sure im wrong

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#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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#111

(Original post by

If u all want the answers then contribute Qs if you can remember them and Mr M will post the answers

**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 y

^{3}in the expansion of (2 + 3y + y

^{2})

^{5 }? (something along the lines of) A horizontal line is drawn through the curves y=log

_{2 }x and y=log

_{2 }(x-3). It crosses y=log

_{2 }x at P and y=log

_{2 }(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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#112

(Original post by

Is there any way to tag a member?

Here's what I remember

4i) Expand (2 + x)

ii) Hence find the coefficient of y

**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 y

^{3}in the expansion of (2 + 3y + y^{2})^{5 }? (something along the lines of) A horizontal line is drawn through the curves y=log_{2 }x and y=log_{2 }(x-3). It crosses y=log_{2 }x at P and y=log_{2 }(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 log

_{2}x onto log

_{2}(x-3)

log

_{2}x has co-ordinates (a , something). Find a.

log

_{2}(x-3) has co-ordinates (something, b) Find b.

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#113

(Original post by

If nobody has the paper we need to try and create a copy of the questions

**FootInMouth**)If nobody has the paper we need to try and create a copy of the questions

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)

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#114

(Original post by

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)

**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)

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#115

(Original post by

There was a question asking what transformation maps log

log

log

**Ranibizumab**)There was a question asking what transformation maps log

_{2}x onto log_{2}(x-3)log

_{2}x has co-ordinates (a , something). Find a.log

_{2}(x-3) has co-ordinates (something, b) Find b.Something is telling me it was Q6 but I'm not sure.

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#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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#118

one of the guys in my fmaths class missed out 4 questions entirely on the paper

Feel bad for him

Feel bad for him

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#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

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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#120

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

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