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OCR (not MEI) Core 3 - 19/01/2011

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Original post by nikita_atikin
Would someone like to verify my answers?

Volumes of revolution 12pi[ln25]

Weird tan question 225/322 (don't even ask)

Last question, range of g(x) > 2(k^0.5)

Simpsons rule 20.3

And can someone tell me the answers to the 1st modulus questions. I think I got it wrong along with pretty much the rest of the paper. :frown:


I agree with all your answers, except the tan one, I think I got it wrong. For the first question I got something along the lines of -3a and a fraction answer with it.
Reply 121
Avatar for Rokaf0
Rokaf0
Original post by nikita_atikin
Would someone like to verify my answers?

Volumes of revolution 12pi[ln25]

Weird tan question 225/322 (don't even ask)

Last question, range of g(x) > 2(k^0.5)

Simpsons rule 20.3

And can someone tell me the answers to the 1st modulus questions. I think I got it wrong along with pretty much the rest of the paper. :frown:


I got the same for volumes of revolution and the weird tan question! Couldn't do the last ones tho :frown:
that exam was evil
I did C4 last week with a raging cold and did better in that than C3 - whats going on

has anyone got any thoughts on the last question ?

I think it was e^2x + Ke^-2x and you had to find the range of the function?
Reply 123
Avatar for I0144
I0144
Missed of the Pi on volumes of revolution...lose 1 mark maybe?
45000 rates of change

the tan question was a bit confusing, wasnt sure whether they wanted tanxcot2xtan4x on its own each or as a product, so i asummed a product.

9ib i got ln(3)^0.5/2, anyone get this?

Cant remember exact but i think the range i got was something like g(x) >= e^((lnk)^0.5) + ke^-((lnk)^0.5)

Overall i reacon i still should get an A
(edited 13 years ago)
Is anyone doing the paper, i want to know the RIGHT answerss/?????
Reply 125
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sand4
Anyone get 2rootK for the last one?
Original post by yellowblob123
that exam was evil
I did C4 last week with a raging cold and did better in that than C3 - whats going on

has anyone got any thoughts on the last question ?

I think it was e^2x + Ke^-2x and you had to find the range of the function?


y> 2(k^0.5)

Had To Differentiate
Original post by yellowblob123
that exam was evil
I did C4 last week with a raging cold and did better in that than C3 - whats going on

has anyone got any thoughts on the last question ?

I think it was e^2x + Ke^-2x and you had to find the range of the function?


You had to differentiate it to find the stationary point (from graph) and g(x)>stationary point.

g(x)>2(k^0.5)
Reply 128
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legoravi
I bet C4 will be the bomb in the summer.

/funny cos i'm asian lol.
Original post by sand4
Anyone get 2rootK for the last one?


Yeaaaaaaaaahhh <3
Reply 130
Avatar for trix909
trix909
What did people actually get for the first question?

For reference the first question was: |3x + 4a| = 5a, where a is a positive constant.

I just did +- (3x+4a) =5a, and got 3x = a and -1/3x= a
Original post by trix909
What did people actually get for the first question?

For reference the first question was: |3x + 4a| = 5a, where a is a positive constant.

I just did +- (3x+4a) =5a, and got 3x = a and -1/3x= a


I think we needed x=? rather than what a is equal to
Original post by trix909
What did people actually get for the first question?

For reference the first question was: |3x + 4a| = 5a, where a is a positive constant.

I just did +- (3x+4a) =5a, and got 3x = a and -1/3x= a


I Got That Also
Reply 133
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trix909
Original post by Glen_Nichols
I think we needed x=? rather than what a is equal to


Damn, well thats 2 marks down the drain, prob would of got one mark for doing a relevant method.
What did everybody get for that horrible transformation of -4f(x+3) - question 2?
anyone get x>(ln3)/4 for the last question, part ii I think
Original post by mathsgeek101
What did everybody get for that horrible transformation of -4f(x+3) - question 2?


My y coordinate was 24 and x...........something like -8 (for the stationary points)
I hope who ever created this paper burns in hell -_- It was barely anything like all the past papers... T.T
Reply 138
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ElMoro
OP
18
Original post by nikita_atikin
Would someone like to verify my answers?

Volumes of revolution 12pi[ln25]

Weird tan question 225/322 (don't even ask)

Last question, range of g(x) &gt; 2(k^0.5)

Simpsons rule 20.3

And can someone tell me the answers to the 1st modulus questions. I think I got it wrong along with pretty much the rest of the paper. :frown:


:eek:

I think I got all of these the smae! :smile:

I think the modulus had a whole number on one side and a fraction (over three) on the other. Don't know if this helps :s-smilie:

Original post by gildartz
anyone get x&gt;(ln3)/4 for the last question, part ii I think


Got this the same :smile:
(edited 13 years ago)
Reply 139
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Rokaf0
I feel a lot better now, know i've done alright apart from the last questions- where i panicked frantically and went from differentiating and attempting to solve, as well as completing the square of an e lmao.

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