Maths Extension 2 thoughts (1 Viewer)

[snail489]

what did you guys get for the a^4 + B^4 + y^4 question? completely fkd that one up

try getting an expression for a.P(a), bP(b) and yP(y) and add them up (because aP(a) = a*0 = 0)

 

[RealiseNothing]

what did you guys get for the a^4 + B^4 + y^4 question? completely fkd that one up

Multiply the cubic by x, then sub in alpha/beta/gamma and add the 3 equations together, and done.

 

[apurba]

How do you do that conics q with the area of triangle??

I got (1/2)(rt(1/a^2 + 1/b^2)) for the area

Someone please tell me they got the same.

 

[apurba]

Multiply the cubic by x, then sub in alpha/beta/gamma and add the 3 equations together, and done.

fuck

 

[leehuan]

I got (1/2)(rt(1/a^2 + 1/b^2)) for the area

Someone please tell me they got the same.

Just realised I lost a mark here...

For some reason I had PQ with |tantheta-sectheta| whereas the perpendicular distance |tantheta+sectheta|

Nvm I'm an idiot THEY WERE BOTH IN THE NUMERATOR LEE

 

[JACO]

I got 1/2 ab for the area of the triangle.

 

[moonbear129]

I need the solutions when is it ready omg

 

[Zen2613]

Somehow I got 1/2 for the triangle. Completely independent of everything!

 

[knightus10]

what did you guys get for the a^4 + B^4 + y^4 question? completely fkd that one up

I got 256.....no idea if that's right though. q was 3 right?

 

[Drsoccerball]

I need the solutions when is it ready omg

You finished the exam like 3 hours ago relax a bit ?

 

[Drsoccerball]

I got 256.....no idea if that's right though. q was 3 right?

Yes to both i think

 

[knightus10]

Hated the conics question so much. One little mistake cost me the 5 marks in that question. Gahhhhh

 

[Thjv]

Somehow I got 1/2 for the triangle. Completely independent of everything!

the answer was 1/2 ab

 

[moonbear129]

okay i can see my predicted raw marks slowly declining

 

[Drsoccerball]

the answer was 1/2 ab

same

 

[knightus10]

By the way, what do you guys consider a good mark? Like i reckon 70 and above is great (scales to E4 i'm assuming). But everyone is saying this year was really easy, so do you think 70 is enough for an E4?

 

[Librah]

Still waiting for the download to finish so i can check out the paper lol

 

[Thjv]

what did you guys get for the a^4 + B^4 + y^4 question? completely fkd that one up

Well since a, b and y are all roots of P(x), then
a^3 + ap + q = 0 ----- (1)
b^3 + bp + q = 0 ----- (2)
y^3 + yp + q = 0 -----(3)

a x (1) + b x (2) + y x (3)

a^4+b^4+y^4 + p(a^2+b^2+y^2) +3q(a+b+y) = 0

(This is all from memory. The polynomial that I wrote may not have been correct)

 

[JACO]

I got 128 for the a^4 + B^4 + y^4 question.

 

[Physicklad]

I got 128 for the a^4 + B^4 + y^4 question.

yep