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Okay I've finished my solutions everybody. Here it is http://community.boredofstudies.org/1278/mathematics-extension-2/386534/carrotsticks-extension-2-hsc-2018-solutions-memes.html#post7303320

I hated this paper. Typing it was a massive bitch to do compared to previous years. I'm also going to post some memes here too. Usual stuff here everybody. Comment if you see errors but I think we should mostly be good. I've taken care to explain things as much as I can to aid understanding...

You just single-handedly doomed the 2019 BOS Trial cohort. Thanks for the inspiration. Good job.

Raw for both.

Hi

\\ $Because $ \frac{1}{\left ( \frac{d^2t}{dx^2} \right )} \neq \frac{dx^2}{dt^2}$ unlike the first derivative where $ \frac{1}{\frac{dt}{dx}} = \frac{dx}{dt} $ Most likely your answer would score 1 out of 3. One mark for the correct first derivative.

Okay uploaded them! Let me know if you see typos =)

Here you go =) https://www.dropbox.com/s/6c47j8mdwuq111p/HSC%202017%20Extension%201%20Solutions.pdf?dl=0 Let me know if you see typos! Thoughts: Eugh the paper is so long. Not particularly difficult or interesting. NESA needs better HSC examiners (hire me pls).

What did you think of the paper?

Nah you'll probably only lose one mark overall.

Okay I'm going to address the a=plus/minus versus a>0 issue. We say a>0 to keep things simple. That is, so that we may assign a physical thing (length of semimajor axis) to the value of "a". But mathematically, this is not a restriction. Q: Will I get penalised for not doing A=plus/minus ...

Weird, I fixed the locus diagram and then it stuffed up again.

I don't even think you would lose any marks. Unless I am mistaken, even in the course it's not clear if A must be zero or not. If NESA can't decide then surely they won't dock you down for that.

I sure hope they can. I'm pretty sure they spend a whole term learning the integer sequence from 1 to 10.

Fixed that one too! Absolute classic.

Today, I learned that I can't count. (cheers man)

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.

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).