Carrotsticks' 2017 Mathematics Extension 2 solutions (1 Viewer)

[Carrotsticks]

Up to Q16 atm and have to do a few diagrams, so won't be too long hopefully.

If you're wondering about my opinion on the paper, I reckon it was a pretty difficult paper compared to other years actually.

Most recent draft:

https://www.dropbox.com/s/75pr12h97fec5p2/HSC 2017 Extension 2 Solutions.pdf?dl=0

My thoughts:

- Overall a pretty difficult paper.
- E4 Cutoff will probably be around 68/100.

 

[kibellion]

ooh what questions in particular?

 

[NinjaDatHSC]

Up to Q16 atm and have to do a few diagrams, so won't be too long hopefully.

If you're wondering about my opinion on the paper, I reckon it was a pretty difficult paper compared to other years actually.

I thought the paper was of medium difficulty, apart from a few questions (the conics & hyperbola + ellipse, that trick for the very last question where you had to subtract got me, q10 mc I didn't know, last part of circle geo, q16 complex numbers summing that thing in part 2 i think)

I'd guess I got around 80-85 raw. Really disappointed in myself tbh.

What do you think the e4 cut off will be?

 

[RandomNG]

Ignore this post.

 

[InteGrand]

Q10 is A.

It's the definition of Trapezoidal Rule.

Q10 is (B).

 

[NinjaDatHSC]

What was question 9?

 

[InteGrand]

What was question 9?

(C)

 

[NinjaDatHSC]

Ok thank god lol

Do you have any idea on what the e4 cut off raw mark wise would be?

 

[Carrotsticks]

Okay done just briefly checking now and formatting etc.

 

[Carrotsticks]

Was stuck on Q16 (a) (ii) for ages because I insisted on trying to be clever and breaking it up into two sum of GPs because the other way is 'stupid'. Turns out that was the way to go top kek (cries).

 

[NinjaDatHSC]

was stuck on q16 (a) (ii) for ages because i insisted on trying to be clever and breaking it up into two sum of gps because the other way is 'stupid'. Turns out that was the way to go top kek (cries).

right same fml wouldn't it be great if i could trust my stupid senses more off lol

 

[RandomNG]

Q10 is (B).

My apologies, I got confused with the 2 choices. Yes it is (B).

 

[Carrotsticks]

The locus question in Q11 (a) is wrong btw, so ignore that. It's basically what I have but the circle falls short of hitting the origin.

 

[trecex1]

Q1 has 8 roots doesn't it?

Also ahh are there 4 values for a in q16? I assumed a had to be positive

Edit: I think 11b) may be wrong? since those values are for a^2 and b^2 not a and b

 

[NinjaDatHSC]

I think you stuffed up 11 (b), a = 2 root 3

 

[pikachu975]

1 is C

 

[Carrotsticks]

Q1 has 8 roots doesn't it?

Also ahh are there 2 values for a in q16? I assumed a had to be positive

Today, I learned that I can't count.

(cheers man)

 

[fluffchuck]

For 11(b), instead of doing b/a, you did (b/a)^2

 

[Carrotsticks]

Fixed that one too! Absolute classic.

 

[NinjaDatHSC]

Hey Carrotsticks, you reckon I would lose 1/2 marks if I got a = 1 and 1/3, but I didn't have the plus minus?