# edexcel C2 23rd May 2018 unofficial mark schemeWatch

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11 months ago
#21
(Original post by Eman0161)
For the circle question can you leave the radius as Root 50?
Don't think so, asked for exact
2
#22
(Original post by Eman0161)
For the circle question can you leave the radius as Root 50?
Nah sorry bro
1
11 months ago
#23
(Original post by Eman0161)
For the circle question can you leave the radius as Root 50?
You’ll get one mark but not both as it said simplified I’m pretty sure
0
11 months ago
#24
For the geometric I got a = 1000 as s=a/1-r so 1-r = 0.1?
0
11 months ago
#25
(Original post by shivalakhani)
1) (2,2) and (6,4rt2)
b) r=51.413
2) 128 + 448x +672k^2x^2 +560k^3x^3
b) k=1.5
3) proof
b) a+b=21
c) b=31 a=-10
d) 24x^2 - 34x + 31
4) Area = 8.75
b) Flag area=20.02
c) 26.79
5) centre-(1,-7)
b) r=5rt2
c) y=0 and y=-14
d) x+7y-2=0
6) a=19000
b) U5=12465.9
c) S12=7176
7) y=625056
a) proof
b) x=1/3
8) x=248.6 , 331.4 (degrees)
ii) theta= 0.258 , 2.89 , 3.48 , 5.94
9) A(4,112)
b) (25/4,0)
c) r=79.77

(btw I tutor even over Skype msg me for details)
Yeah I got the exact same
0
11 months ago
#26
(Original post by J0skin)
For the geometric I got a = 1000 as s=a/1-r so 1-r = 0.1?
a = 19,000
3
11 months ago
#27
What was question 7
0
11 months ago
#28
For people saying a was 1000, it had to be 19000 as if you do the sum equation, n tends towards infinity at large values (ie 500), sum to infinity was 10k and you only get this value with 19000 and with 1000 you get 567
2
11 months ago
#29
(Original post by Eman0161)
For the circle question can you leave the raidius as Root 50?
Yeah you can because it said exact answe so it is full marks
1
11 months ago
#30
Can I write 5.657 for Q1 instead of 4rt2？
3
11 months ago
#31
(Original post by shivalakhani)
1) (2,2) and (6,4rt2)
b) r=51.413
2) 128 + 448x +672k^2x^2 +560k^3x^3
b) k=1.5
3) proof
b) a+b=21
c) b=31 a=-10
d) 24x^2 - 34x + 31
4) Area = 8.75
b) Flag area=20.02
c) 26.79
5) centre-(1,-7)
b) r=5rt2
c) y=0 and y=-14
d) x+7y-2=0
6) a=19000
b) U5=12465.9
c) S12=7176
7) y=625056
a) proof
b) x=1/3
8) x=248.6 , 331.4 (degrees)
ii) theta= 0.258 , 2.89 , 3.48 , 5.94
9) A(4,112)
b) (25/4,0)
c) r=79.77

(btw I tutor even over Skype msg me for details)
Isn’t question 7 625.56 for the value of y?
17
11 months ago
#32
How do you do 7a) ?
0
11 months ago
#33
(Original post by Ewan 2000)
You’ll get one mark but not both as it said simplified I’m pretty sure
(Original post by Kccc)
Can I write 5.657 for Q1 instead of 4rt2？
It didnt ask for exact form so im hoping we can
0
11 months ago
#34
Does anyone remember what the question for Q7 was?
0
11 months ago
#35
i
(Original post by shivalakhani)
1) (2,2) and (6,4rt2)
b) r=51.413
2) 128 + 448x +672k^2x^2 +560k^3x^3
b) k=1.5
3) proof
b) a+b=21
c) b=31 a=-10
d) 24x^2 - 34x + 31
4) Area = 8.75
b) Flag area=20.02
c) 26.79
5) centre-(1,-7)
b) r=5rt2
c) y=0 and y=-14
d) x+7y-2=0
6) a=19000
b) U5=12465.9
c) S12=7176
7) y=625056
a) proof
b) x=1/3
8) x=248.6 , 331.4 (degrees)
ii) theta= 0.258 , 2.89 , 3.48 , 5.94
9) A(4,112)
b) (25/4,0)
c) r=79.77

(btw I tutor even over Skype msg me for details)
i got 0.48 and 2.94 rads not 3.48 and 5.94
0
11 months ago
#36
[QUOTE=shivalakhani;77803536]

7) y=625056

Shouldnt this have been 625.56?
6
11 months ago
#37
(Original post by r2d914)
Does anyone remember what the question for Q7 was?
1.01^y-1 = 500 (find y)
1
11 months ago
#38
I Think 7d is x-7y-2=0
4
11 months ago
#39
What was q7?
0
11 months ago
#40
7176 is right, exams and calculators are just tricky when it comes to powers

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