OCR (not MEI) C1 13/05/13

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i thought the exam was fairly straight firward except for the last question were i got k to be 3 and a lot of people i spoke to got -5, this stopped me from completing the last part

Reply 21

Ellie_Rosa

I got k as -5 but I messed up the last question and got something stupid like (8,-717). I also messed up the PQ question, I got root 10 but apparently the answer was 4.5

Reply 22

eggfriedrice

Original post by BankOfPigs

If I recall, you got a nice quadratic in that question, by dividing by 1-x then rearranging into (x+2)^2 = 0

I got -2 -27 as well, since it was meant to be tangent I'm pretty sure it was meant to only have one point.

I think there are two methods for finding k, which i got as -5.
You can either use the formula and get 18 = 6+-root84-12k, which gets you k as -5, or sub it into the dy / dx equation with x as -3.

Why would you divide by x-1? 0:

I got 3x^2 +6x=0 so x(x+2)^2 =0
So x=0 or x=-2

Reply 23

aran0909

i got k=3 which is definatley wrong
for the co-or dinates i got the length to be 4.5, (1,0)

Reply 24

cheetahs56

Original post by eggfriedrice

Why would you divide by x-1? 0:

I got 3x^2 +6x=0 so x(x+2)^2 =0
So x=0 or x=-2

Snap, but I got -4 for k instead of -5. Do you guys think i'll get marks for finding value of k? I expanded, diffrentiated but must have missed a 1 somewhere. Also for the tangent last question i got x=0 or x=-2, so got -2 as the x co-ordinate but -9 as value of y due to my k being wrong, will i get any marks for these questions?

Reply 25

cheetahs56

Original post by greyed96

i thought the exam was fairly straight firward except for the last question were i got k to be 3 and a lot of people i spoke to got -5, this stopped me from completing the last part

I thought the same but got k as -4 :frown:

Must have missed a 1 somewhere. Correct method and ecf marks should follow though :wink:

Reply 26

Aapi27

So im guessing (1,18) and 1,0) for A is wrong that that k isn't 4..... :frown:

.
Some plz put up an unofficial mark... Before I cry my self dry ....
So no one self found it really hard .....

Sorry don't mean to sound depressing but I'm just really annoyed and upset....

Reply 27

eggfriedrice

Original post by cheetahs56

I don't think you'll get the marks for calculating the wrong k value, but you'll get some method parts.
For the second question, you might get error carried forward for the method.

Reply 28

flyhigh99

Do you guys think the grade boundaries will be high?
It wasn't a bad paper :smile:

Reply 29

Ellie_Rosa

Original post by Aapi27

So im guessing (1,18) and 1,0) for A is wrong that that k isn't 4..... :frown:

.
Some plz put up an unofficial mark... Before I cry my self dry ....
So no one self found it really hard .....

Sorry don't mean to sound depressing but I'm just really annoyed and upset....

I found it hard, and I messed a lot of it up, but everyone else at my school found it alright. And you might get method marks for A

Reply 30

cheetahs56

Original post by eggfriedrice

I don't think you'll get the marks for calculating the wrong k value, but you'll get some method parts.
For the second question, you might get error carried forward for the method.

Yep that's what I was thinking lol, knew i wouldn't get answer marks :tongue:

. Was thinking 4 or 5 out of the 7? And would i lose an answer mark for the second question? I know my method was right, hopefully i'll get 4, maybe 3 out of the 5 marks there as well.

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Reply 31

princess_parisa_22

can we compile a question paper together on here if we're allowed? these answers will be pretty useless unless everyone remembers what they wrote, and i'm sure not everyone will =/ i have a bad memory

Reply 32

Dugald

1i 12route5
1iii 5route5
(-3/2,17/4) was the minimum point

Reply 33

flyhigh99

Guys i think the grade boundaries might be pretty high

Reply 34

username571327

i got k as -5
i didn't understand the last question so definately lost 5 marks there :/

Reply 35

eggfriedrice

Original post by flyhigh99

Guys i think the grade boundaries might be pretty high

I agree. The paper wasn't particularly hard. );

Reply 36

username571327

Original post by Z.M.1

What value did people get for k? And how?
I expanded the brackets, then differentiated it and said when dy/dx = 0 its a stationary point, then subbed in x=-3 and found k to be 49. I know that's wrong but would I get any method marks? Thanks :smile:

first time i did it i got 49. I believe it was because when you had -(4-k)x and you expanded it, you didnt change it to +k. thats what i had done anyway.