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Edexcel C3 June 2016 - Unofficial Mark Scheme

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Reply 80
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Further
2
Original post by eyeman567
Yeah I think it was that, I don't get how you solve it though

I subbed G into F

Got 28 / (x-2) = x + 1

Then ended up with X^2 - x - 30 = 0

which Im pretty sure is wrong and unsolvable


(x-6)(x+5)=0
x=6
x=-5
@kprime2 You uploading the paper today?
Reply 82
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Ejsjwwj
1
What was the gradient for 6b
Reply 83
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gh2
1
Original post by AvocadosConstant
Same here :s-smilie:

They changed the sign from cos - sin something to cos + sin, on the bottom of the fraction so you had to reverse this in Rcos(x-26.57)
I don't remember the first question what were the numbers?
What was the question for 5i? Sure I got an answer of 0.9016 or something
I got 8cosec(4y), apart from that I agree completely
Wait I'm dumb I forgot to flip the 4 to 1/4 when doing dx/dy -> dy/dx :frown:
(edited 7 years ago)
how do you do question 5 a and b?
Original post by eyeman567
Yeah I think it was that, I don't get how you solve it though

I subbed G into F

Got 28 / (x-2) = x + 1

Then ended up with X^2 - x - 30 = 0

which Im pretty sure is wrong and unsolvable


(x+5)(x-6)
Original post by gh2
They changed the sign from cos - sin something to cos + sin, on the bottom of the fraction so you had to reverse this in Rcos(x-26.57)


Crap.
Reply 90
Avatar for akiwicat
akiwicat
How many marks was 5ii? I think I differentiated it to 4Sin2YCos2Y and then I got 0.5Cosec2Y for my final answer because I forgot to double the angle
Reply 91
Avatar for Alerdo
Alerdo
Can someone post the method for the question where there was long division and finding the equation of the normal? I know my answer is wrong but I don't know how and I'm hoping I didn't lose all those marks
Original post by eyeman567
Yeah I think it was that, I don't get how you solve it though

I subbed G into F

Got 28 / (x-2) = x + 1

Then ended up with X^2 - x - 30 = 0

which Im pretty sure is wrong and unsolvable


(x-6)(x+5)? maybe use the quadratic formula to check next time
For q2 was it x<-root5 and x>root5 for dy/dx<0
Does anyone remember how many marks each question was worth?
For the arc sin i used 90 and -90 degrees instead of half pi would i lose a mark for that?
Reply 96
Avatar for Beboxed
Beboxed
Original post by Pyslocke
For q2 was it x<-root5 and x>root5 for dy/dx<0


Yep - that's what I got anyway
What do you guys think the grade boundaries will be?
Original post by theereflex
For 3(c), I don't understand why the lowest value of theta wasn't just 33 from part b?

anyone help?


It was the same but it had PLUS sin rather than MINUS sin
Reply 99
Avatar for Mahiali
Mahiali
1
Original post by Kay_Gupta
How many marks was question 6b out of?


I think it was out of 4

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