Maths Extension 2 Discussion 2017

[YmerBushati]

its not 2x, its 2y, you have to find the equation of the line, think it was y=1/2 x + 1 from memory.

[Acing]

Hey!

Thanks for your speedy solutions! How do you think this paper ranked among the rest? Any estimates for the E4 cut off?

[YmerBushati]

Hey!

Thanks for your speedy solutions! How do you think this paper ranked among the rest? Any estimates for the E4 cut off?

This year was definitely a lot easier than other years, especially the last question, which was one of the easiest in a while. Not sure about E4 cutoff but definitely will need 99 or 100 for a state rank. A couple of marks will kill you in an exam like this (e.g. me who thought that the integral of tan-1x was 1/1+x^2 and is getting straight 0 for a super easy integration)

[RuiAce]

Hey!

Thanks for your speedy solutions! How do you think this paper ranked among the rest? Any estimates for the E4 cut off?

I've been hearing mixed opinions about the paper's difficulty. I'll comment on this later

[pikachu975]

its not 2x, its 2y, you have to find the equation of the line, think it was y=1/2 x + 1 from memory.

Yep that looks right

[akash6969]

This years paper was a bit easier than 2016 or 2015, probs same difficulty as 2014. Band 6 cutoff would probs be in the mid 70's

[YmerBushati]

https://www.dropbox.com/s/75pr12h97fec5p2/HSC%202017%20Extension%202%20Solutions.pdf?dl=0
Full solutions

[YmerBushati]

This years paper was a bit easier than 2016 or 2015, probs same difficulty as 2014. Band 6 cutoff would probs be in the mid 70's

Angery React for making me change my creative - Kevin Zhang

[NinjaDatHSC1]

Very mixed response, my tutor reckons the e4 cut off will be around 68-71

[armtistic]

Carrotsticks got a different volume for 13d) just a heads up

[RuiAce]

Carrotsticks got a different volume for 13d) just a heads up

Scroll up. I've already confirmed with someone that my trapezium volume question is wrong

[NinjaDatHSC1]

Hey Rui,

Just wondering, you reckon we would lose a mark if we didn't include the negative solutions for a in that q16 question? (I just wrote 1 and 1/3)

[RuiAce]

Hey Rui,

Just wondering, you reckon we would lose a mark if we didn't include the negative solutions for a in that q16 question? (I just wrote 1 and 1/3)

Actually unsure about that one tbh.

Convention is always to regard \( a > 0 \) to avoid nuisances. So technically you shouldn't. But theoretically speaking a negative value of a would still work and isn't incorrect...

Personally, I think it'd be kinda rude if they deducted marks for ignoring the negative values for a. But at the same time, they have all the rights to do it because it's not an incorrect answer.

[louisa_wg]

What do you think the e4 cut off will be for this year? Thanks for posting the answers so quickly by the way!

[Checkmate123]

What do you think a 94ish raw would scale to?