# Thread: BoS Maths Trials 2017

1. ## Re: BoS Maths Trials 2017

aye lmao apparently people think

$(1-\sqrt{h})^2 = 1-h$

rip there goes ur marks

also

a lot of people forgot that √k = 1-√h

their area function was (1-√h)² instead of (1-√h)⁴

there goes another mark

bless u janzen choi for being the one person who got my spiky volume correct <3

another kid almost got the answer correct but they forgot to double the result bc they were only finding the upper half volume...

rip in pieces

also a lot of u stoners thought the curved edges were like a square minus a circle????

can u even graphs plz

2. ## Re: BoS Maths Trials 2017

that's not even close

3. ## Re: BoS Maths Trials 2017

Got the solution when I got home

4. ## Re: BoS Maths Trials 2017

when will solutions be up??

5. ## Re: BoS Maths Trials 2017

Before the respective HSC exam

Though feel free to request hints/short solutions to any particular question you want an answer for now

6. ## Re: BoS Maths Trials 2017

Originally Posted by Trebla
Before the respective HSC exam

Though feel free to request hints/short solutions to any particular question you want an answer for now
For the Q11 (c)(i) vectors question, after using the triangular inequality, how do you come to the inequality you're required to prove? I can't seem to work out how to algebra this.

7. ## Re: BoS Maths Trials 2017

Originally Posted by SaltSolutionPromo
For the Q11 (c)(i) vectors question, after using the triangular inequality, how do you come to the inequality you're required to prove? I can't seem to work out how to algebra this.
Use the triangle inequality on the LHS then expand and simplify

8. ## Re: BoS Maths Trials 2017

Originally Posted by SaltSolutionPromo
For the Q11 (c)(i) vectors question, after using the triangular inequality, how do you come to the inequality you're required to prove? I can't seem to work out how to algebra this.
Basically the sum of the terms inside the absolute values on the LHS is equal to the expression in the absolute values on the RHS (that is, (a-b)(c-d) + (a-d)(b-c) = (a-c)(b-d)). So the result follows from the triangle inequality (|z| + |w| ≥ |z + w|).

9. ## Re: BoS Maths Trials 2017

Just to check, is it too much to ask to see our papers? Only if it's not a hassle, wouldn't mind seeing the places where I screwed up when I shouldn't have

(I haven't looked at the paper since, decided past HSC papers were a bit more down to earth wew)

10. ## Re: BoS Maths Trials 2017

keen for the solutions & results. hope I get at least 5%

11. ## Re: BoS Maths Trials 2017

It might be difficult since all the papers were separated question by question for marking in different piles, and there is a lot of pages that needs to be scanned for one person, and given that the organisers are doing it on a voluntary basis and they have full time work (the people who wrote the exams), it is highly unlikely they will have the time to do that... except in exceptional circumstances or by exercise of their personal discretion.

12. ## Re: BoS Maths Trials 2017

Originally Posted by strawberrye
It might be difficult since all the papers were separated question by question for marking in different piles, and there is a lot of pages that needs to be scanned for one person, and given that the organisers are doing it on a voluntary basis and they have full time work (the people who wrote the exams), it is highly unlikely they will have the time to do that... except in exceptional circumstances or by exercise of their personal discretion.
Ah right, that's okay. Thanks though, I'll keep my eye out for the answers + the final marks then ^^

13. ## Re: BoS Maths Trials 2017

Originally Posted by Raeservoir
Just to check, is it too much to ask to see our papers? Only if it's not a hassle, wouldn't mind seeing the places where I screwed up when I shouldn't have

(I haven't looked at the paper since, decided past HSC papers were a bit more down to earth wew)
I'm looking into this possibility, but the decision ultimately lies with Carrotsticks and Trebla.

14. ## Re: BoS Maths Trials 2017

Originally Posted by strawberrye
It might be difficult since all the papers were separated question by question for marking in different piles, and there is a lot of pages that needs to be scanned for one person, and given that the organisers are doing it on a voluntary basis and they have full time work (the people who wrote the exams), it is highly unlikely they will have the time to do that... except in exceptional circumstances or by exercise of their personal discretion.
This. Thank you for explaining, Strawberrye.

15. ## Re: BoS Maths Trials 2017

Hey, when will the marks be shown to the forum? If they have already is it possible for a link? Thank you very much!

16. ## Re: BoS Maths Trials 2017

Originally Posted by qazzopro
Hey, when will the marks be shown to the forum? If they have already is it possible for a link? Thank you very much!
Soon. Give it a couple more hours

17. ## Re: BoS Maths Trials 2017

Originally Posted by Trebla
Soon. Give it a couple more hours
Does that mean solutions will be out as well?

18. ## Re: BoS Maths Trials 2017

when one person is out of commission for a few hours and everyone stays up late getting solutions together :')

#sleep4days

Boom

20. ## Re: BoS Maths Trials 2017

Originally Posted by shehan123
Hey, could someone hint me how to do the first part of the pyramid question in the Extension 1 Paper? Its the only one i still cant get
Extend OP to hit the triangle QRS at M, then calculate MP in two different ways.

21. ## Re: BoS Maths Trials 2017

what schools came to the top?

22. ## Re: BoS Maths Trials 2017

Congrats Calamebe with the new record

23. ## Re: BoS Maths Trials 2017

when one person is out of commission for a few hours and everyone stays up late getting solutions together :')

#sleep4days
Who was out of commission? I'll ban them.

24. ## Re: BoS Maths Trials 2017

Did better than I thought

Congrats on the 74 calamebe new record

8/15 in that q16 is crazy

25. ## Re: BoS Maths Trials 2017

What is the reasoning behind the second line of the estimate for |Q(k*alpha)| in the solution to Q16h) ?

As written, that does not seem complete to me.

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