BOS MX2 Trials discussion thread. (1 Viewer)

[deswa1]

Did anybody work out Q16?

Well I definitely didn't- you saw my extensive attempt at Q16 lol. I'll try it sometime soon but I don't think I'll get it...

Why is ln using absolute values?

I have never seen absolute values used with it except on here ?

Yeah you don't need it- I just do it out of habit but its not neccessary

 

[Carrotsticks]

Nice work asianese.

 

[tomp1612]

Hey carrot where do you get all these questions their insane

 

[deswa1]

Hey carrot where do you get all these questions their insane

He made them which is why its extra impressive. I reckon BOS should throw a party for Carrot at the end of the year (srs)

 

[asianese]

His head **

 

[Carrotsticks]

 

[Carrotsticks]

 

[deswa1]

Nah, I think my solution was WAY superior to this I still can't believe my method when this is so simple lol

 

[twinklegal19]

He made them which is why its extra impressive. I reckon BOS should throw a party for Carrot at the end of the year (srs)

+1

Nah, I think my solution was WAY superior to this I still can't believe my method when this is so simple lol

loved your method

it's so quick and simple aye?

 

[Shadowdude]

This thread is for discussing questions/solutions etc etc.

Here is a copy of the paper: View attachment 26476

I must give sincere thanks to Trebla and seanieg89, who have both greatly helped make the Exam what it is. Their input has been most valuable, and there wouldn't be a BOS Exam without their assistance in checking questions and verifying solutions.

Massive thanks to you both =)

file size: 666KB

IT IS AN OMEN

 

[deswa1]

Ok guys what were your favourite questions in the paper?

Personally, I really liked the prove a+b=c (the tangent question), Q14b (the roots of z^n=1), the whole of Q15 and all those ones about explaining the geometric significance of the result proven. I think I would have like Q16 if I could understand it lol

 

[Trebla]

Hey carrot where do you get all these questions their insane

He made them which is why its extra impressive. I reckon BOS should throw a party for Carrot at the end of the year (srs)

His head **

A lot of them are well known results in higher level mathematics. Also, some of those questions came from me. Namely:
Q8
Q10
Q13b)
Q15a) - though Carrot modified its original form (which had an induction component) and added in part iv)

Notice that those were generally the easier ones

Not stealing Carrot's thunder though, most of the good ones were by him.

 

[chriss95]

^ was q10 B? Mainly a guess.

If you have a double complex root, does that mean the conjugate is a double as well?

 

[Trebla]

^ was q10 B? Mainly a guess.

If you have a double complex root, does that mean the conjugate is a double as well?

Yes, but you also needed to check whether the rest of the roots were real or not

 

[deswa1]

The other roots were not real apparently- I got that one wrong. Lol I got the four unreal roots and I figured it was too much effort for one mark to check the other two

 

[RealiseNothing]

^ was q10 B? Mainly a guess.

If you have a double complex root, does that mean the conjugate is a double as well?

It's A, there are no real roots.

 

[barbernator]

@ trebla. Im slowly working my way through Q16. Im doing 16 b) i) 1).

I shuffled the sigma to get it in the form of the inequality, and then applied the absolute value signs, but I am just wondering, why is,



as was stated in a) ?? (as we know that all b(coefficients) are > 0?)

 

[Bored_of_HSC]

The other roots were not real apparently- I got that one wrong.Lol I got the four unreal roots and I figured it was too much effort for one mark to check the other two

hahah

 

[Trebla]

You have something like -|x - y| and when x > y, it becomes -(x - y)

 

[Trebla]

The other roots were not real apparently- I got that one wrong. Lol I got the four unreal roots and I figured it was too much effort for one mark to check the other two

It's not that much effort lol. Quickest way to find two remaining roots is to use the relationship between roots and coefficients.