General Thoughts: Mathematics Extension 2 (3 Viewers)

[iStudent]

Did anyone use 15cii for 15civ? :/
Can't see the connection in 15cii with the rest of the q. Unless you're not meant to use calculus for 15ciii o.o

 

[SquareZ]

Was there even an end of question for Question 11
I didn't see the words End of question 11 and asked the person but she said there wasn't one... ?

 

[gahyunkk]

How did u guys prove Q16(a)(ii)? Collinear one

 

[faisalabdul16]

This was a good paper, harder than last years.

Idk why there so many graph questions, it pissed me off because of how much time wasted. Hopefully they're not anal in marking it, also what did everyone get for the volume with the trapezium slices?

Also, I think a raw mark of 65ish would align to 90

 

[iStudent]

How did u guys prove Q16(a)(ii)? Collinear one

use xpq = ypr and the 2 right angles in the semicircle. Do a similar process to i for c2 and you end up with angle apx=angle rpc

 

[GOsie]

This was a good paper, harder than last years.

Idk why there so many graph questions, it pissed me off because of how much time wasted. Hopefully they're not anal in marking it, also what did everyone get for the volume with the trapezium slices?

Also, I think a raw mark of 65ish would align to 90

Does 64/5 or something like that, maybe with a pi sound reasonable?

 

[SquareZ]

How did u guys prove Q16(a)(ii)? Collinear one

You prove that one side had all the same angles with the other side and then you can say it is 180 degrees thus making <APC a straight line therefore collinear

 

[Carrotsticks]

You could have been a smart-ass for Q14 (a) (ii) and said that since x=1 is a root of multiplicity 3, three of the roots are 1, 1 and 1.

So two complex roots of P(x) are 1 and 1, since all real numbers are complex numbers =)

 

[njweno]

- Didn't even bother attempting 16b, got home and realised how easy i and ii were haha
- The plane mechanics question, parts 1 and ii, WTF?? Anyone get them out?
- Got cooked by induction
- Bad paper

 

[mreditor16]

This was a good paper, harder than last years.

Idk why there so many graph questions, it pissed me off because of how much time wasted. Hopefully they're not anal in marking it, also what did everyone get for the volume with the trapezium slices?

Also, I think a raw mark of 65ish would align to 90

I got 24 root 3 all over 5

 

[mreditor16]

You could have been a smart-ass for Q14 (a) (ii) and said that since x=1 is a root of multiplicity 3, three of the roots are 1, 1 and 1.

So two complex roots of P(x) are 1 and 1, since all real numbers are complex numbers =)

just no.

 

[iStudent]

You could have been a smart-ass for Q14 (a) (ii) and said that since x=1 is a root of multiplicity 3, three of the roots are 1, 1 and 1.

So two complex roots of P(x) are 1 and 1, since all real numbers are complex numbers =)

Lol. Would you get the marks for that?

 

[mreditor16]

- Didn't even bother attempting 16b, got home and realised how easy i and ii were haha
- The plane mechanics question, parts 1 and ii, WTF?? Anyone get them out?
- Got cooked by induction
- Bad paper

wtf? since was there an induction Q?

 

[GOsie]

You could have been a smart-ass for Q14 (a) (ii) and said that since x=1 is a root of multiplicity 3, three of the roots are 1, 1 and 1.

So two complex roots of P(x) are 1 and 1, since all real numbers are complex numbers =)

I thought about that. But it specified the two complex roots

 

[SquareZ]

- Got cooked by induction

What induction?

 

[harrypotterfan]

It was do hard I'm only expecting around 96 raw... what wouldthat align to? Freaking 4u

 

[sallythai96]

thought the paper was harder than last year and couldn't do a lot especially the mechanics and the second conics question. Wasn't that easy and screwed up badly -_-

 

[iStudent]

wtf? since was there an induction Q?

Perhaps used induction for 16 bi xD

 

[Carrotsticks]

Lol. Would you get the marks for that?

Haha of course not.

I thought about that. But it specified the two complex roots

'The' means nothing to me =)

 

[mreditor16]

okay here are some of my answers. one disclaimer - I did not get time to check answers.

q11 a) I) root 2 cis ( - pi /4) ii) -4 / 5 - 2/5 i

b) pi - 6 all over 2 (pi)^2

e) 216 pi units cubed

Q12. b) ii) pi / 18 , 11pi / 18, 13 pi /18
d) iii) 3 pi - 8 all over 12

Q13 a) 2 (root 3) - 3 all over 6
b) 24 root 3 all over 5

Q14. ii) -3/ 2 plus minus (root 15)/2 i

b) ii) pi /4

c ii) 150 M ln (5) all over F hours

Q16 c) x all over (1 + ln x) + C

again, reiterating these are merely my answers