# Thread: 2006 HSC Mathematics Solutions

1. ## Re: 2006 HSC Mathematics Solutions

Yes, of course your correct... i'll ammend the solutions asap, thanks for bringing it to my attention.

3. ## Re: 2006 HSC Mathematics Solutions

Okay guys, all the errors brought up so far have been incorporated into the solutions... and now we have solutions v.1.1

4. ## Re: 2006 HSC Mathematics Solutions

lol you didn't need to use the quadratic formula on 9 (b) (i).
it seems i got question 8 (b) (ii) wrong when i was so sure i got it right
guess i'll just fail life now huh :P

5. ## Re: 2006 HSC Mathematics Solutions

dude just pointing out your solution to 7b iii) is wrong. in the first set of brackets in the third line, you had sin(2pi/3) as (2pi - root3)/2, whereas it should only be (root3)/2 so the answer comes out being 7.4 or so i think. also, an answer for 6a iii), the prove it's a rhombus one, would be great as i'm unsure about it. oh and in question 6b iii), i put the limiting value as 450 cause it only decreases from this initial value. i had never seen the term "limiting value" with regards to exponential growth/decay before so i assumed it was asking for the limit of how high the population gets. does this seem reasonable enough to get the mark? or am i way off track... thanks anyone who replies

6. ## Re: 2006 HSC Mathematics Solutions

DUDES!!!! Seriously, why bother doin this!!?!? Regardless of what u do frm now on, u CANNOT change anything about wat u did, so stuff it. Go out and hav some fun, all year 12's deserve to enjoy life now(after all exams are done of course)

7. ## Re: 2006 HSC Mathematics Solutions

hey Goodhew, with question 4C it doesnt say specifically that the girl does not put the chess pieces back after she picks them.. so doesnt t that mean the probability of chosing a colour at any time is 0.5? write back asap pls

8. ## Re: 2006 HSC Mathematics Solutions

yes it is non-replacement probability, SHE DOES NOT PUT THE CHESS PIECES BACK!!!
That was confirmed by my mathematics teacher. I know a really smart girl who lost 4 marks in that probability.
Silly mistakes these days(I lost like 3-10, am I bad)

9. ## Re: 2006 HSC Mathematics Solutions

in the probability question is doesnt specify whether she puts the pieces back or not. like what if she just picks one but doesnt actually take it away. thats what im trying to say. BOS should excuse that question

10. ## Re: 2006 HSC Mathematics Solutions

Originally Posted by T.Goodhew
Solutions by me . Only Q10 iv) & v) are not included due to lack of time...

Mathematics (2Unit) HSC Solutions - 2006 (v1.1)
i guess the question are so easy that u can make the answer thta fast
haha
=D

11. ## Re: 2006 HSC Mathematics Solutions

Yeah unfortunately made some silly errors, but cleared most up i think... what else do you expect when you do the HSC at midnight lol

12. ## Re: 2006 HSC Mathematics Solutions

Originally Posted by T.Goodhew
Yeah unfortunately made lots of silly errors, but cleared most up i think... what else do you expect when you do the HSC at midnight lol
lol
yesh...u need to be really alert to do it.
Or else u will do some of the dumbest mistake ever.
xD

13. ## Re: 2006 HSC Mathematics Solutions

Originally Posted by rusty123
dude just pointing out your solution to 7b iii) is wrong. in the first set of brackets in the third line, you had sin(2pi/3) as (2pi - root3)/2, whereas it should only be (root3)/2 so the answer comes out being 7.4 or so i think. also, an answer for 6a iii), the prove it's a rhombus one, would be great as i'm unsure about it. oh and in question 6b iii), i put the limiting value as 450 cause it only decreases from this initial value. i had never seen the term "limiting value" with regards to exponential growth/decay before so i assumed it was asking for the limit of how high the population gets. does this seem reasonable enough to get the mark? or am i way off track... thanks anyone who replies
You're absolutely right about the trig error, that's been fixed in the newest version of the solutions. I'm afraid the limiting value solution is correct however.

14. ## Re: 2006 HSC Mathematics Solutions

Originally Posted by jfan30
hey Goodhew, with question 4C it doesnt say specifically that the girl does not put the chess pieces back after she picks them.. so doesnt t that mean the probability of chosing a colour at any time is 0.5? write back asap pls
The probabilities are without replacement as shown in the current version of the solutions. This is primarily because the question asks for different squares.

15. ## Re: 2006 HSC Mathematics Solutions

Originally Posted by T.Goodhew
The probabilities are without replacement as shown in the current version of the solutions. This is primarily because the question asks for different squares.
are u sure?

ohh wellz..
what can i do.
I got only one HSC.
and i 've done it.
=D

16. ## Re: 2006 HSC Mathematics Solutions

Here are my worked solutions. Based on the comments above, I'm fairly sure that these are OK.

17. ## Re: 2006 HSC Mathematics Solutions

Originally Posted by PC
Here are my worked solutions. Based on the comments above, I'm fairly sure that these are OK.
Lol..
Graet!

18. ## Re: 2006 HSC Mathematics Solutions

This is my solution to the last two parts of question 10, just in case anyone still cares (I am a bored accelerant at the moment). I hope this will clear up the errors with other solutions posted. Anyone with a graphing program is advised to make graphs of y and A against x, as this illustrates how the problem can be solved. Any comments or corrections, please write to selig90@hotmail.com

19. ## Re: 2006 HSC Mathematics Solutions

Originally Posted by PC
Here are my worked solutions. Based on the comments above, I'm fairly sure that these are OK.
Awesome, your solutions are identical to mine. Yay So v 1.25 of the solutions on the first post in this forum, as well as your solutions must be the correct solutions...phew.

20. ## Re: 2006 HSC Mathematics Solutions

your solutions are pretty good, except q10, the answa is 53.3333, not 32 root 3, otherwise they arecorrect, also the domain is 8/3 less than equal to x which is less than or equal to 6.
Also everyone is forgetting to justify the minimum area they got in q10biv, did use guys use second derivative or show a change in sign.

21. ## Re: 2006 HSC Mathematics Solutions

Crap.

Thanks Kido. You're absolutely right!

22. ## Re: 2006 HSC Mathematics Solutions

Don't worry man, all the other answers are pretty cool. You would have scored at least 117 raw with those answers.

23. ## Re: 2006 HSC Mathematics Solutions

you're legend for putting up the worked answers, thanks heaps!

24. ## Re: 2006 HSC Mathematics Solutions

thanks man, your a heap of help, espesh for me whos gotta check their workin out :wave:

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