# Carrotsticks' Extension 1 HSC 2013 Solutions (1 Viewer)

#### asianese

##### Σ
The binomial you factorised was supposed to be x. Small issue.

#### duckysd

##### New Member
lost about 10 marks! Damn.
Also, I did the final part of the last question. HOWEVER, instead of using the approximation t= 0.56, I used t= 0.57 (because that is what I get from 1 application of Newtons method). From there, I did everything else, but my valuse are: (e^(e^0.57) = 5.87) but my other r value, I put down the exact same approximation 0.097. Would that still be full marks?

#### hayabusaboston

##### Well-Known Member
Yaaah 62/70! SILLY F'ING MISTAAAKES

#### Carrotsticks

##### Retired
The binomial you factorised was supposed to be x. Small issue.
Thanks =)

Fixed some other small issues with Q14 binomial.

Thanks

#### Locus

##### Member
I have a question ... idk how to use latex so i'll just type it out

In the equation they gave us for 14biii)
Isn't there a general term in there which is [2n-k]C[k] . x^(2n) . 2^(2n-2k) which I'll call /1/
Since we want to equate the coefficients of the term x^(2n)...
can we sub the coefficient of /1/ t into 14bii) ... so it becomes the answer
and n is on top of the sigma instead of 2n because (2n-k >/= k) hence the greatest possible k value is n for the combination to remain valid
So would this assumption suffice instead of writing out for k=1,2,3... ?

Don't flame me if I'm wrong.
I'm just asking this because that was my thought process that seemed right when i did it in the test

#### Carrotsticks

##### Retired
Going out for a bit of coffee with Trebla now, so I won't be replying/fixing mistakes for the next 30 minutes or so!

But again please let me know if you spot anything wrong =)

#### RealiseNothing

##### what is that?It is Cowpea
Going out for a bit of coffee with Trebla now, so I won't be replying/fixing mistakes for the next 30 minutes or so!

But again please let me know if you spot anything wrong =)
You said this just to show off didn't you.

#### Makematics

##### hwpo13
^ Which is why a good night of sleep can make all the difference.
i did get a good night's sleep?

#### anomalousdecay

Sillies man. Lost a mark for differentiation of q11.g.

#### Carrotsticks

##### Retired
You said this just to show off didn't you.
Back =)

Not to show off haha. Just wanted a bit of a break from the laptop plus needed to have a good walk.

Sure sure carret

lol you guys

#### roseyc

##### New Member
does anyone have the actual exam paper?

#### Makematics

##### hwpo13
Sillies man. Lost a mark for differentiation of q11.g.
i lost a mark on the god damn small angle sin limits. FML

#### anomalousdecay

i lost a mark on the god damn small angle sin limits. FML
I made the mistake of forgetting to quickly check with L'Hopital's on tuesday for mc 9, lost one mark.
THen I drilled into my head that I would definitely use L'Hopital's this time.

Next thing you know, I forget to put x^2 in differentiation a few parts later.
I never made a mistake in chain rule for a year until now. WTF.

#### huongtrinh

##### New Member
I don't know why but I got 0.094 for the last question :-w :-w :-w

#### Acturial

##### New Member
WOWWWWW got them all correct ... paper was soooo easy but harder than last years..... do i get state rank or no IF i did get them all right?