Maths Ext 2 Predictions/Thoughts (3 Viewers)

[AlphaBetaThetaGamma]

i thought you needed 100 no matter what for a sr. thats the case for x1 i think

Correct I got 100 for x1 but i got nowhere close to a state rank.

 

[Jojofelyx]

my estimate is 75 for e4. rui from atar notes said "This, however, has got to be the most draining MX2 paper I've done in a very long time. The only other time I recall of feeling so defeated was in 2018 or something where the chaotic Euclidean geometry question showed up" according to the raw marks database, in 2018, an e4 cutoff was exactly 72 raw but tbh i think more people did better in this exam than i originally thought so e4 might be higher like 75-77, possibly 80. a raw of 90 might then scale to a 95. would be amazing if it was closer to 2014 scaling, raw 90 scaled to a juicy 97.

What does he reckon raw 55 goes to lol, i think the lowest in my class reckons she got 55/100, hopefully it goes to like 80

 

[Chungus]

What does he reckon raw 55 goes to lol, i think the lowest in my class reckons she got 55/100, hopefully it goes to like 80

anything above 50 will probably be above 70, so probably like 74 or something

 

[tywebb]

A Scots student made a video for Q16b for the Sydney Morning Herald: https://www.smh.com.au/national/nsw...stion-in-this-year-s-hsc-20211117-p599sp.html

His solution is also available as a pdf file at https://www.scribd.com/document/540518837/2021-HSC-Mathematics-Extension-2-hardest-question#download

 

[Siwel]

ah yes the classic article where boomers question why we still do things like this because it has no value to society. a pattern ive noticed is that top schools always get the opp to do this.

interesting they picked 16b, what about a and c? I wonder if just not many had a sufficient answer for c

 

[notme123]

interesting they picked 16b, what about a and c? I wonder if just not many had a sufficient answer for c

maybe because b had the most marks.

plus i hate how they say this is the hardest q in the entire hsc. this is not it by a mile and a half because you cant brand anything as the hardest q. how do you compare this to an essay q where there are multiple right answers

 

[Siwel]

maybe because b had the most marks.

yeah thats true, but out of all 3 surely b is the most like a normal question

 

[Siwel]

ikr it was pretty tame for being the hardest q. the only way someone can screw up is effing up the vomit algebra at the beginning.

they did hold your hand until the algebra, just the amount of variables i magically made a u^2 become u^3 and i wouldnt be suprised if others did the same somewhere

 

[notme123]

they did hold your hand until the algebra, just the amount of variables i magically made a u^2 become u^3 and i wouldnt be suprised if others did the same somewhere

it was t for me. for some reason a t vanished from one of the terms so my quadratic ended up having 2 terms as the constant, therefore the discriminant was fugly and basically barred me from justifying as well. i reckon recognising discriminant with a carried error will warrant at least 3 marks hopefully but maybe thats too lenient, ive seen other say that getting the quad is enough for 3 but i dont think so

 

[Siwel]

it was t for me. for some reason a t vanished from one of the terms so my quadratic ended up having 2 terms as the constant, therefore the discriminant was fugly and basically barred me from justifying as well

somehow my mistake turned out into great theta values so i assumed i had done it right...

 

[notme123]

somehow my mistake turned out into great theta values so i assumed i had done it right...

i woudlve thought the same as well.

 

[Siwel]

i woudlve thought the same as well.

i was like theta=0, makes sense, theta=pi/4 and thought ive done a great job now let me contemplate 16a) for an hour

 

[tywebb]

Just finished watching the video. My only criticism is at the very end he used a because symbol ∵ whereas he should have used a therefore symbol ∴

 

[notme123]

Just finished watching the video. My only criticism is at the very end he used a because symbol ∵ whereas he should have used a therefore symbol ∴

unwatchable. this kid shouldn't even be doing maths let alone 4u. jk jk but thats such a simple mistake how can you screw that up thats worse than my mistake.

 

[Siwel]

unwatchable. this kid shouldn't even be doing maths let alone 4u. jk jk but thats such a simple mistake how can you screw that up thats worse than my mistake.

yeah i would say messing up algebra is underappreciated marks wise so maybe i get 5, i did have the intent to get the right answer

 

[notme123]

yeah i would say messing up algebra is underappreciated marks wise so maybe i get 5, i did have the intent to get the right answer

exactly, might as well give me a sr at this point.

 

[Siwel]

exactly, might as well give me a sr at this point.

ngl for the weird circle and ln function volumes i somehow made up my own way to find the volumes rotated and got the right solution

 

[Paradoxica]

Matrix solutions: https://www.matrix.edu.au/2021-hsc-maths-ext-2-exam-paper-solutions/

Other sites to keep an eye on are

https://www.itute.com/download-free-vce-maths-resources/free-maths-exams/

and

http://advancedmathematics.com.au (Terry Lee)

Historically Terry Lee used to be the first with solutions up.

Recently he has been beaten by a few others.

Itute are very slow to put them up - maybe a month or so - some say they take a wiser approach than rushing to be the first.

Itute also seem to be consistently the most complete too - even putting them up for Standard 1 - which is very rare.

Matrix didn't put a dashed line for the straight line segment joining z=0 to z=-π. -1 mark.

 

[notme123]

ngl for the weird circle and ln function volumes i somehow made up my own way to find the volumes rotated and got the right solution

i didnt even realise you could do have a cube - a hemisphere i did a full integral hahaha

 

[tywebb]

unwatchable. this kid shouldn't even be doing maths let alone 4u. jk jk but thats such a simple mistake how can you screw that up thats worse than my mistake.

My criticism stands.

But I want to downplay it. It's not a great drama.

He went through quite a bit of hefty algebra and I'm glad he was the one doing it, not me.

Overall I think he did a great job.