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Edexcel C3 June 2016 - Unofficial Mark Scheme

I'm not 100% sure on all of these, but I think most are correct.
kprime2's model answers: http://www.thestudentroom.co.uk/attachment.php?attachmentid=554936&d=1466601487
Question 1

Spoiler

Question 2

Spoiler

Question 3

Spoiler

Question 4

Spoiler

Question 5

Spoiler

Question 6

Spoiler

Question 7

Spoiler

Question 8

Spoiler

Question 9

Spoiler

PDF with full worked solutions : http://www.thestudentroom.co.uk/attachment.php?attachmentid=554397&d=1466526735
3c:
IMG_2703.jpg
(edited 7 years ago)

Scroll to see replies

For 5i what did people do with the sin and cos?
(edited 7 years ago)
if you don't mind would you be able to do your working out if at all possible? 🙈
Reply 3
Avatar for jwanjwan
jwanjwan
2
i agree however i dont know about 7 part b, i cant really remember the question but i believe i left it in terms of sin but your answer looks more complete
Reply 4
Avatar for Gouber
Gouber
3
What was question 6 again please?
Original post by veldt127
I'm not 100% sure on all of these, but I think most are correct.

1.
A -5, 6
B 6

2.
A (20-4x^2)/(x^2+5)^2 Might not be simplest form
B >sqrt(5), <-sqrt(5)

3.
A R= sqrt(5)
a= 26.57°
B 33.0°, 273.9°
C 86.1°

4.
Ai 21
ii ln(2.5)
iii 25
B Show that question
C 1.4368, 1.4373
D Show the root was in [1.4365, 1.4375]

5.
i 0.9463
ii 0.5cosec(4Y)

6.
A A=3, B=4
B Normal eqn. -0.5x + 17.5

7.
A graph of arcsin, sort of a rotated S shape. Went through (0,0), (-1,-pi/2), (1,pi/2)
B -1-0.5sqrt(3)

8.
A Trig proof
B -2.848, -1.277, 0.294, 1.865

9.
A 6.740 - dose after 4 hours
B show that dose equalled a value after 7 hours
C 5ln(2 + 2e^-1)
A = 5, B = 2

Sorry about the formatting, I'll try to improve it once I'm home.


Im sure only the middle two values were allowed for 8B
Original post by particlestudent
Im sure only the middle two values were allowed for 8B

wasn't it between pi and -pi? or was it pi/2?
Reply 7
Avatar for marethyu
marethyu
2
Original post by veldt127
I'm not 100% sure on all of these, but I think most are correct.

1.
A -5, 6
B 6

2.
A (20-4x^2)/(x^2+5)^2 Might not be simplest form
B >sqrt(5), <-sqrt(5)

3.
A R= sqrt(5)
a= 26.57°
B 33.0°, 273.9°
C 86.1°

4.
Ai 21
ii ln(2.5)
iii 25
B Show that question
C 1.4368, 1.4373
D Show the root was in [1.4365, 1.4375]

5.
i 0.9463
ii 0.5cosec(4Y)

6.
A A=3, B=4
B Normal eqn. -0.5x + 17.5

7.
A graph of arcsin, sort of a rotated S shape. Went through (0,0), (-1,-pi/2), (1,pi/2)
B -1-0.5sqrt(3)

8.
A Trig proof
B -2.848, -1.277, 0.294, 1.865

9.
A 6.740 - dose after 4 hours
B show that dose equalled a value after 7 hours
C 5ln(2 + 2e^-1)
A = 5, B = 2

Sorry about the formatting, I'll try to improve it once I'm home.


Can't remember what I put for 3B but apart from that all the same
Original post by veldt127
I'm not 100% sure on all of these, but I think most are correct.

1.
A -5, 6
B 6

2.
A (20-4x^2)/(x^2+5)^2 Might not be simplest form
B >sqrt(5), <-sqrt(5)

3.
A R= sqrt(5)
a= 26.57°
B 33.0°, 273.9°
C 86.1°

4.
Ai 21
ii ln(2.5)
iii 25
B Show that question
C 1.4368, 1.4373
D Show the root was in [1.4365, 1.4375]

5.
i 0.9463
ii 0.5cosec(4Y)

6.
A A=3, B=4
B Normal eqn. -0.5x + 17.5

7.
A graph of arcsin, sort of a rotated S shape. Went through (0,0), (-1,-pi/2), (1,pi/2)
B -1-0.5sqrt(3)

8.
A Trig proof
B -2.848, -1.277, 0.294, 1.865

9.
A 6.740 - dose after 4 hours
B show that dose equalled a value after 7 hours
C 5ln(2 + 2e^-1)
A = 5, B = 2

Sorry about the formatting, I'll try to improve it once I'm home.


Agree with all except for 3c which I know I got wrong.

Does anyone know if it specified what form it wanted the normal to f(x) in?
Reply 9
Avatar for veldt127
veldt127
OP
2
Original post by mpwb12345
if you don't mind would you be able to do your working out if at all possible? 🙈


When I get home I'll try to for the ones I remember

Original post by Gouber
What was question 6 again please?


Long division, can't remember exactly values. It then gave the result of the division as a curve, and you had to find the normal when X=3.
Reply 10
Avatar for mk_98
mk_98
8
Original post by Dieselblue
For 5i what did people do with the sin and cos?

Also part 2a is wrong, -4x^2-20=-4(x^2+5) so -4/x^2+5


It was - 4x^2+20 wasn't it? Otherwise how would you get the range of values for the second part?
Reply 11
Avatar for veldt127
veldt127
OP
2
Original post by Dieselblue
For 5i what did people do with the sin and cos?

Also part 2a is wrong, -4x^2-20=-4(x^2+5) so -4/x^2+5


I got 20-4x^2, I thought it might be like that but couldn't find where I'd gone wrong. You might be right on that one

Edit: your answer gives a non real root
(edited 7 years ago)
Original post by particlestudent
Im sure only the middle two values were allowed for 8B

Yeah I think I remember the limits between -pi/2 and pi/2
Original post by veldt127
I'm not 100% sure on all of these, but I think most are correct.

1.
A -5, 6
B 6

2.
A (20-4x^2)/(x^2+5)^2 Might not be simplest form
B >sqrt(5), <-sqrt(5)

3.
A R= sqrt(5)
a= 26.57°
B 33.0°, 273.9°
C 86.1°

4.
Ai 21
ii ln(2.5)
iii 25
B Show that question
C 1.4368, 1.4373
D Show the root was in [1.4365, 1.4375]

5.
i 0.9463
ii 0.5cosec(4Y)

6.
A A=3, B=4
B Normal eqn. -0.5x + 17.5

7.
A graph of arcsin, sort of a rotated S shape. Went through (0,0), (-1,-pi/2), (1,pi/2)
B -1-0.5sqrt(3)

8.
A Trig proof
B -2.848, -1.277, 0.294, 1.865

9.
A 6.740 - dose after 4 hours
B show that dose equalled a value after 7 hours
C 5ln(2 + 2e^-1)
A = 5, B = 2

Sorry about the formatting, I'll try to improve it once I'm home.



Can anyone remind me what the questions were for 5i) and 6a)
Original post by veldt127
I got 20-4x, I thought it might be like that but couldn't find where I'd gone wrong. You might be right on that one
there was a common factor of -4 which allowed the top and bottom to cancel
Original post by Mattematics
Agree with all except for 3c which I know I got wrong.

Does anyone know if it specified what form it wanted the normal to f(x) in?

Didnt specify but I put it as like 2y+x... as I thought it looked cleaner
Reply 16
Avatar for veldt127
veldt127
OP
2
Original post by Mattematics
Agree with all except for 3c which I know I got wrong.

Does anyone know if it specified what form it wanted the normal to f(x) in?


It didn't specify
Original post by veldt127
It didn't specify


Brilliant :smile:

Think I got 73/75.
Original post by DomWoodcock
Yeah I think I remember the limits between -pi/2 and pi/2


Im pretty sure they were pi and -pi
Original post by Mattematics
Brilliant :smile:

Think I got 73/75.


Same unless I lose working marks and those answers are mostly right. Doubt it's gonna be enough for 100 UMS though, seems a lot of people found it easy

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