C2 unofficial answers Watch

cookie_raider01
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#181
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#181
guys go here answers+questions+explanations
very detailed
http://www.thestudentroom.co.uk/show....php?t=4117823
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Anith20
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#182
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#182
(Original post by FakeDumbledore)
Unlucky mate I've seen the official mark scheme and a few of these are wrong :/
Better luck next year in your resit...
Hi can u post the link for the mark scheme . Thank u.
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TeeEm
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#183
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#183
(Original post by Anith20)
Hi can u post the link for the mark scheme . Thank u.
Can we have a look please?
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demotivated
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#184
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#184
What if for the perimeter question, my x value was 15.6 instead of 16.6 as most people got, but my perimeter was still right (120m)? Would I lose any marks?
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dashh
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#185
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#185
8b) Rules of indices mean that:


2^2X+5 - 7(2^X)


2^5 * (2^2X) - 7 (2^X) = 0

We now have a quadratic in 2^X.

Let 2^X= X

Therefore, 32X^2 - 7X= 0

Factorise: X(32X-7)=0

Therefore, 32X=7

X= 7/32.

As we let X=2^X, 7/32 also equals 2^X

Therefore, X=log base 2 (7/32)

=-2.19
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Saz2swizzy
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#186
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#186
How many marks was trapezium part C and logs part B????
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erfanullah
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#187
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#187
Guys last year for edexcel c2 it was 59 for an A THAT paper was easier with only 1 confusing question but not tough where this paper i found had a tough log question and lots of places slightly awkward in questions 9 or 10 is it possible, as this paper in my opinion was harder than last year that the grade bound for an A is like 57 due to what i said
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AstarAstarA
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#188
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#188
(Original post by Isabellagoodwinx)
That's weird because I got the c1 mark scheme the day of the exam, I don't mean the actual mark scheme I mean one a teacher has done
Yeh, a TSR member called Arsey was famous for uploading model answers two hours after the maths exams. Today, the teacher informed us that Edexcel don't want the model answers to be uploaded.
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dotdani11
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#189
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#189
(Original post by AstarAstarA)
Geometric:
b) 256
c) 1.602

Binomial:
A = 16
k = 7/2
B = 936

Integration:
S = 24.3

Trapezium:
a) 7
b) 20.75
c) R = 5.75

Factor theorem:
a) 5
c) (x + 2)(3x + 2)(2x - 1)

Differentiation(Q10):
a) 1/3PIx^2
d) Minimum = 120m
c) x = 16.63... => f''(x) = 0.437 > 0

Trig identities:
a) Theta = 8/15Pi , -2/15Pi
b) x = 194.5, 345.5

Circle:
a) root(34)
c) 3x + 5x - 95 = 0

Log:
i) (a - 5)/9
ii) -2.19

Likely UMS:

68 - A
57 - B
49 - C
41 - D
36 - E
U
68 for an A!!! man u tripping
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AstarAstarA
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#190
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#190
(Original post by demotivated)
What if for the perimeter question, my x value was 15.6 instead of 16.6 as most people got, but my perimeter was still right (120m)? Would I lose any marks?
I have no idea how you got 120m with the wrong x value.
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tripleseven
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#191
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#191
Any ideas for minimum raw mark for 100 UMS on this paper?
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dotdani11
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#192
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#192
(Original post by AstarAstarA)
Geometric:
b) 256
c) 1.602

Binomial:
A = 16
k = 7/2
B = 936

Integration:
S = 24.3

Trapezium:
a) 7
b) 20.75
c) R = 5.75

Factor theorem:
a) 5
c) (x + 2)(3x + 2)(2x - 1)

Differentiation(Q10):
a) 1/3PIx^2
d) Minimum = 120m
c) x = 16.63... => f''(x) = 0.437 > 0

Trig identities:
a) Theta = 8/15Pi , -2/15Pi
b) x = 194.5, 345.5

Circle:
a) root(34)
c) 3x + 5x - 95 = 0

Log:
i) (a - 5)/9
ii) -2.19

Likely UMS:

68 - A
57 - B
49 - C
41 - D
36 - E
U
For the log question you had to make a the subject.
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mottom888
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#193
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#193
Did anyone else get k=28 for the binomial question? Because 2kx gave the difference of 56
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AstarAstarA
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#194
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#194
(Original post by dotdani11)
For the log question you had to make a the subject.
Unlucky. Next time read the question. 'b in terms of a'
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mottom888
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#195
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#195
(Original post by AstarAstarA)
Geometric:
b) 256
c) 1.602

Binomial:
A = 16
k = 7/2
B = 936

Integration:
S = 24.3

Trapezium:
a) 7
b) 20.75
c) R = 5.75

Factor theorem:
a) 5
c) (x + 2)(3x + 2)(2x - 1)

Differentiation(Q10):
a) 1/3PIx^2
d) Minimum = 120m
c) x = 16.63... => f''(x) = 0.437 > 0

Trig identities:
a) Theta = 8/15Pi , -2/15Pi
b) x = 194.5, 345.5

Circle:
a) root(34)
c) 3x + 5x - 95 = 0

Log:
i) (a - 5)/9
ii) -2.19

Likely UMS:

68 - A
57 - B
49 - C
41 - D
36 - E
U
Did you not get k=28 for the binomial question, because 2kx gave the difference of 56k
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AstarAstarA
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#196
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#196
(Original post by tripleseven)
Any ideas for minimum raw mark for 100 UMS on this paper?
I'm hoping for 74/75 but this was an easy paper compared to June 2015 (look at TSR polls) and the UMS last year was 75/75
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jovdawesome
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#197
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#197
(Original post by eftio.gea)
Guys wasn't part a of Q9 = 1/3pi(x^2)????

because the sector area is 1/2r^2(theta)
which is 1/2(x^2)(2/3pi)

= 2/6pi(x^2)
= 1/3pi(x^2)
??
For Q9 it was = pi x2 /3
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Einstein101
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#198
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#198
(Original post by LewisClothier)
it asked for b in terms of a. it was: b=a/9-5/9
I got that aswel!!! But apparently its b = (a-5)/9 :/
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mottom888
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#199
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#199
Genuinely think you got binomial b) wrong, and therefore c) from follow on.
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Nickkobilnyk
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#200
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#200
(Original post by eftio.gea)
Guys wasn't part a of Q9 = 1/3pi(x^2)????

because the sector area is 1/2r^2(theta)
which is 1/2(x^2)(2/3pi)

= 2/6pi(x^2)
= 1/3pi(x^2)
??
Yeah I got that mate
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