ATAR Notes: Forum

Archived Discussion => HSC Exam Discussion 2019 => Maths Exams => Topic started by: Joseph41 on October 09, 2019, 04:23:34 pm

Title: HSC Maths Extension 1 - 04/11/19 - Discussion, Questions & Potential Solutions
Post by: Joseph41 on October 09, 2019, 04:23:34 pm: Post all exam discussion, questions, and sample solutions for Maths Extension 1 here!
Title: Re: HSC Maths Extension 1 - 04/11/19 - Discussion, Questions & Potential Solutions
Post by: AHafza on November 04, 2019, 12:26:52 pm: Any solutions guys ?
Title: Re: HSC Maths Extension 1 - 04/11/19 - Discussion, Questions & Potential Solutions
Post by: RuiAce on November 04, 2019, 01:03:21 pm: Quote from: AHafza on November 04, 2019, 12:26:52 pm
Any solutions guys ?
I have class until 2PM. I can start writing up some solutions around then
Title: Re: HSC Maths Extension 1 - 04/11/19 - Discussion, Questions & Potential Solutions
Post by: AHafza on November 04, 2019, 01:26:15 pm: Thanks your a legend
Title: Re: HSC Maths Extension 1 - 04/11/19 - Discussion, Questions & Potential Solutions
Post by: jenjennie on November 04, 2019, 01:33:05 pm: So.... does anyone have any ideas on the E4 cut-off? Or what around a high 80s would scale up to?

EDIT: after looking at solutions I got 89 raw. It's just that I did the k, k+1 thing in Q13 really weird (I did it via greatest coefficient) so idk if they'll take a mark off, I mean I got the answer but I doubt it was a very ideal way of working. So maybe an 87 if that's another mark gone. Then again, maybe an 86 because I didn't explain the one intersection point thing very well (I was just like yeah look at the graph, I didn't have none of that increasing decreasing x>k etc. etc. stuff lmfaooooooo)

From school rank I'm in the B6 range so it's just hoping I get like a 93/94 raw lmaoooo but it'll be really hard since this year was heaps easier than every other year. Yikes hope I scraped through for Eng too because I was doing relatively ok until I reckon I flip flopped mod C creative. GL to everyone for other exams!
Title: Re: HSC Maths Extension 1 - 04/11/19 - Discussion, Questions & Potential Solutions
Post by: AHafza on November 04, 2019, 01:49:56 pm: I’d like to know too... let’s wait for ruiace’s prediction
Title: Re: HSC Maths Extension 1 - 04/11/19 - Discussion, Questions & Potential Solutions
Post by: fun_jirachi on November 04, 2019, 03:09:11 pm: Sample solutions; please:
a) Point out any mistakes! And tell me if something needs more explanation, particularly multiple-choice because I left most explanation blank. Also, tell me if you can't read my writing.
b) Click to enlarge the photos!

Multiple Choice
(https://i.imgur.com/iVahRvz.jpg)
Question 11
(https://i.imgur.com/yqJlaEg.jpg)
(https://i.imgur.com/QTofQqm.jpg)
Question 12
(https://i.imgur.com/vTYj8YB.jpg)
(https://i.imgur.com/VRRFNQM.jpg)
(https://i.imgur.com/9r2CLVR.jpg)
Title: Re: HSC Maths Extension 1 - 04/11/19 - Discussion, Questions & Potential Solutions
Post by: RuiAce on November 04, 2019, 03:49:44 pm: Remaining solutions. As above, let me know if there's any error and please click the photo to resize it :)

Question 13
(https://i.imgur.com/e3ujuld.png)
Question 14
(https://i.imgur.com/HCFJUD6.png)

I must say, there were definitely quite a few weird questions again. Q14 got a bit difficult to carefully navigate at the end. They definitely also had quite abstract Q9 and Q10 multiple choices as well!
Title: Re: HSC Maths Extension 1 - 04/11/19 - Discussion, Questions & Potential Solutions
Post by: worldno1 on November 04, 2019, 03:58:47 pm: 65-66/70 raw will align to? :(

Gosh, also if I expressed alpha in terms of k instead of k in terms of alpha...am I going to get deducted? I had k in terms of alpha like 2 lines above. :'(
Title: Re: HSC Maths Extension 1 - 04/11/19 - Discussion, Questions & Potential Solutions
Post by: alisontungmy on November 04, 2019, 04:57:10 pm: Quote from: worldno1 on November 04, 2019, 03:58:47 pm
65-66/70 raw will align to? :(

Gosh, also if I expressed alpha in terms of k instead of k in terms of alpha...am I going to get deducted? I had k in terms of alpha like 2 lines above. :'(

Hmm maybe 97?(judging from previous years)
Argh i am so careless...lost a few marks :'(
(I think i did better in 4u than this...nvm it is over)
Title: Re: HSC Maths Extension 1 - 04/11/19 - Discussion, Questions & Potential Solutions
Post by: worldno1 on November 04, 2019, 05:16:39 pm: Quote from: alisontungmy on November 04, 2019, 04:57:10 pm
Hmm maybe 97?(judging from previous years)
Argh i am so careless...lost a few marks :'(
(I think i did better in 4u than this...nvm it is over)
Same here lmao I struggled more with 3u. yikes. feels bad when every mark weights more too since it's only out of 70.
Title: Re: HSC Maths Extension 1 - 04/11/19 - Discussion, Questions & Potential Solutions
Post by: iktimal on November 04, 2019, 05:47:58 pm: Hey, can someone who has the paper post it, if you have photos please????
Title: Re: HSC Maths Extension 1 - 04/11/19 - Discussion, Questions & Potential Solutions
Post by: VVVVVVVv on November 04, 2019, 07:43:41 pm: hey i was wondering if its okay for part 14 cii to use the argument of inverse and stuff where i let cos(x)=q and cos(x-alpa)=q and then say that because of range sin(x-aplha) is negative of sin(x). if u get what i mean
Title: Re: HSC Maths Extension 1 - 04/11/19 - Discussion, Questions & Potential Solutions
Post by: alisontungmy on November 04, 2019, 08:20:37 pm: Quote from: VVVVVVVv on November 04, 2019, 07:43:41 pm
hey i was wondering if its okay for part 14 cii to use the argument of inverse and stuff where i let cos(x)=q and cos(x-alpa)=q and then say that because of range sin(x-aplha) is negative of sin(x). if u get what i mean
Yes i think! A few people in my school did that, as long as your argument is clear I'm sure you are fine
Title: Re: HSC Maths Extension 1 - 04/11/19 - Discussion, Questions & Potential Solutions
Post by: AHafza on November 05, 2019, 09:05:34 am: So what would 60,61/70 align too?
I blew the state rank, made the worst mistakes. 😭
Title: Re: HSC Maths Extension 1 - 04/11/19 - Discussion, Questions & Potential Solutions
Post by: infinityandbeyond on November 06, 2019, 03:09:59 pm: I think a 94-95 based on the raw marks database. Really good for extension though. You shouldn't worry.