Carrotsticks' MX2 HSC 2013 Solutions (5 Viewers)

[obliviousninja]

For q12 dii)
Did we just have to show that P was the midpoint of AB to show O lies on the circle? did we have to give reasoning or something that PA and PB were equal radii?

that's wat I did.
came out of exam, face palmed coz I coulda saved time by proving they were perpendicular, right angle subtended by diameter.

 

[Makematics]

1-2 marks

lose 1-2 marks or get 1-2 marks?

 

[RealiseNothing]

One mark was probably for using Interrogation by parts

One mark for doing what now?

 

[RealiseNothing]

lose 1-2 marks or get 1-2 marks?

Get, I'd be more leaning towards 2/4.

 

[RealiseNothing]

that's wat I did.
came out of exam, face palmed coz I coulda saved time by proving they were perpendicular, right angle subtended by diameter.

Yer but that doesn't mean that P is the centre.

 

[anomalousdecay]

that's wat I did.
came out of exam, face palmed coz I coulda saved time by proving they were perpendicular, right angle subtended by diameter.

I did it by finding the lengths of each and stating they were all equal radii. Is that still ok?

 

[anomalousdecay]

One mark for doing what now?

Pardon the pun.

 

[RealiseNothing]

I did it by finding the lengths of each and stating they were all equal radii. Is that still ok?

That's right.

 

[AnimeX]

You had to also state that angle AOB was a right angle.

what about finding equation of circle and finding x and y intercepts being A and B?
does this work aswell?

also, if I did two inflexions for the y^2 = f(x) graph where y=1, the question is worth 2 marks, will I lose one?

 

[Menomaths]

Does Terry Lee put up 2U solutions or does no one care about 2U?

 

[RealiseNothing]

what about finding equation of circle and finding x and y intercepts being A and B?
does this work aswell?

That can work if you did it properly, it's hard though without seeing working out. But assuming you did it all right, it's fine.

 

[RealiseNothing]

Does Terry Lee put up 2U solutions or does no one care about 2U?

That was today?

 

[anomalousdecay]

That was today?

Yeah. Its at the same time. Then General was on at 2pm.

 

[obliviousninja]

That was today?

yo, can look at the attachment in the carrotsticks forum.
I need help, just pm me wat I'm doing wrong, coz the answer simply doesn't come out.

 

[RealiseNothing]

Yeah. Its at the same time. Then General was on at 2pm.

I know Was a joke since he said no one cares about 2U.

 

[RealiseNothing]

yo, can look at the attachment in the carrotsticks forum.
I need help, just pm me wat I'm doing wrong, coz the answer simply doesn't come out.

I'd rather not destroy my neck looking at it.

 

[anomalousdecay]

I know Was a joke since he said no one cares about 2U.

I think you just interrogated me. Again.

 

[obliviousninja]

I'd rather not destroy my neck looking at it.

lol. right click save as, rotate in picture viewer

 

[RealiseNothing]

lol. right click save as, rotate in picture viewer

cbf

 

[Trebla]

Finally, fixed everything. Thanks Trebla! Had the answer but was freaking out because I didn't rationalise the denominator so I thought I had it wrong, and I was at the end of my tether.

Could also be the 2x large red bull cans making me more jittery than usual.

I'm a 'dingus' too.

Spent 1 hour on a Cosine rule question because I could not do the following:

1. Use the cosine rule correctly.

2. Use SOH CAH TOA.

Always glad to help bby. Sorry I prolonged your frustration when I said I would send over my solution to how I got my answer and took like 30 minutes to do so. It's always fun doing HSC Maths at work hehe.