OCR (NOT MEI) Core 2 Exam - 22nd May 2014

For the integration f(y) question I rearranged it fine and did the method fine but I must have made a calculation error wrong somewhere because I ended up with 68/3 instead of 14/3

How many marks do you think I will drop?

I got 68/3 too! I hope we won't drop many marks, maybe just an accuracy one. I panicked and just wrote 68/3 was equal to 14/3 at the end :s-smilie:

Reply 81

BrokenS0ulz

3

I got 10.2 for trapezium rule Q?

Reply 82

mitchellshazia

6

Original post by junebugg99

Will someone explain to me how you were meant to do you the log question please :colondollar:

2^(4x-1) = 3^(5-2x)
log2^(4x-1) = log 3^(5-2x)
(4x-1)log2 = (5-2x)log3
4xlog2 - log2 = 5log3 - 2xlog3
4xlog2 + 2xlog3 = 5log3 + log2
x(4log2 + 2log3) = log243 + log2
x = log(243x2)/(log16 + log9)
x = log(486)/log(16x9) = log(486)/log(144)

Reply 83

newgu

How did you do the logs question?

Reply 84

katt123

1

Original post by BrokenS0ulz

I got 10.2 for trapezium rule Q?

Same!

Reply 85

AMDD

Original post by arryson

What did you guys get for the exact area of the shaded segment? I think I got something like 88. summat

yeah i got 88.4 or something like that

Reply 86

hellosfs

Oh man I got log121.5 / log 144 !!! multiplied instead of divided ... ;(

Reply 87

arryson

X = 5log3 + log2/4log2 +2log 3 unsimplified. How many marks do you think I'd have lost guys?

Reply 88

BrokenS0ulz

3

Original post by hellosfs

Oh man I got log121.5 / log 144 !!! multiplied instead of divided ... ;(

You should get 5 if not 4 out of 6 :smile:

!

Reply 89

BrokenS0ulz

3

Original post by arryson

X = 5log3 + log2/4log2 +2log 3 unsimplified. How many marks do you think I'd have lost guys?

Id say only 2

Reply 90

nectempus

1

Jan13 was a very hard paper and that was 54 for an A, i'm thinking 55-57 for an A on this one

Reply 91

username1107011

1

Original post by arryson

X = 5log3 + log2/4log2 +2log 3 unsimplified. How many marks do you think I'd have lost guys?

2 at most I'd say

Reply 92

AMDD

Original post by BrokenS0ulz

I agree with all your answers except 7c. I think I got 3 +- root 5?

i got those too and also for 3b) i got 48pie-36x3^1/2

Reply 93

Shivakaran

Original post by p625ccc

A list of C2 answers that I memorised
1. Q1
a. 36.3
b. 9.822
c. 14.5

2. Q2
a. 2,5,8
b. 2420

3. Q3
a. 8pie
b. 48-36*3^1/2

4. Q4
a. 71.6 251.6 116.6 296.6
5. Q5
a. Log486/log144

6. Q6
a. X^12+8x^7+24x^32x^-3+16x^-8
b. 1/13+1+8-16-16/7

7. Q7
a. 100
b. 3
c. 3+5^1/2 3-5^1/2

8. Q8
a. N=28
b. R=-1/2 a=6

I agree with all of Q1 except 1b - 3 sig fig
I agree with all of Q2, Q3, Q4, Q5, Q6 and Q8
For Q7, wasn't it 100 for 7a, use of factor theorem to prove
and 7c x = 3, x=3+root5, x = 3-root5

Reply 94

The_Blade

OP

6

Original post by newgu

How did you do the logs question?

i did alot of what i first thought was bull crap but turns out i was right

i did it in pencil at first

Reply 95

junebugg99

Original post by mitchellshazia

2^(4x-1) = 3^(5-2x)
log2^(4x-1) = log 3^(5-2x)
(4x-1)log2 = (5-2x)log3
4xlog2 - log2 = 5log3 - 2xlog3
4xlog2 + 2xlog3 = 5log3 + log2
x(4log2 + 2log3) = log243 + log2
x = log(243x2)/(log16 + log9)
x = log(486)/log(16x9) = log(486)/log(144)

Ah thanks! I got to the third step and then didn't know what to do :frown:

Reply 96

arryson

I'll that it was harder than June 2013 (60 for an A) but not harder than January 2013 (54 for an A). So I'd say boundaries will be minimum 58...

Reply 97

bmunro

what do you reckon grade boundaries will be?

Reply 98

halima firdaus

Original post by p625ccc

A list of C2 answers that I memorised
1. Q1
a. 36.3
b. 9.822
c. 14.5

2. Q2
a. 2,5,8
b. 2420

3. Q3
a. 8pie
b. 48-36*3^1/2

4. Q4
a. 71.6 251.6 116.6 296.6
5. Q5
a. Log486/log144

6. Q6
a. X^12+8x^7+24x^32x^-3+16x^-8
b. 1/13+1+8-16-16/7

7. Q7
a. 100
b. 3
c. 3+5^1/2 3-5^1/2

8. Q8
a. N=28
b. R=-1/2 a=6

hey can you put how many marks each question were worth so I can get an idea of what I got wrong... thanks...!