Maths Methods 3/4 Help Thread 2011

[mattshen]

+1 LOL @ luffy

[nacho]

+1 LOL @ luffy

luffy's insane

[luken93]

Hahaha I mean everything, binom, norm, invnorm etc etc.

[b^3]

I would try to do it aswell, but I'm not 100% sure either. We didn't do it in class, I only learnt it off here from reading the methods help thread. Did any school actually get taught to do the X~Bi(10,0.5) ?

[gossamer]

I would try to do it aswell, but I'm not 100% sure either. We didn't do it in class, I only learnt it off here from reading the methods help thread. Did any school actually get taught to do the X~Bi(10,0.5) ?

Hm.. I personally try and define X, and then write X~Bi(n,p) or X~N(mean,var) but since I don't pay much attention in class, I couldn't tell you if I was actually taught to do that.

If you do it (so long as you don't do it incorrectly), they can't exactly take marks off you  so... *shrug*

[paulsterio]

Did any school actually get taught to do the X~Bi(10,0.5) ?

Yes, I was

Unless I'm blind, has anyone posted a definitive guide to the methodology of writing out probability questions without calc syntax?

I've wrote a rudimentary "guide" here

[BlueSky_3]

Kilbaha 2009 Exam 1 - can anyone explain why the definite integral is from x=0 rather than x=-.5 ?

[luffy]

Unless I'm blind, has anyone posted a definitive guide to the methodology of writing out probability questions without calc syntax?

I'd do it, but I'm not entirely sure myself, and my teachers have never even mentioned it

haha dude last page!
and these vociferous PMs from luffy:

I swear to god.... I've told you at least 100 times that calc syntax will make you lose marks rather than gain.... Are you like stupid? Seriously... wth.

Are you trying to detract from the fact that your so stupid for asking the question? (I'm 100% serious here.)

Whn specifying domains for things invilvig infinity,
for example R+ , but we want to use the other notation:
(0, infinity) do we have to place a '+' sign in front of infinity?

And... Oh... My.... GOD! Quit methods asap. Uninstall VCE.exe.

That question would be fair enough if you were worried about the most minute things because you know the rest of the content to the 100% level. I hope you realise you have no chance of getting a 35+, and if you were able to somehow fluke this feat, I'll shave my ass, put a bag over my head, and let you walk me in public with a leash around my neck.

How much time did you take to create those "PM's"? Seriously T_T. Major editing going on. ehh?

[paulsterio]

How much time did you take to create those "PM's"? Seriously T_T. Major editing going on. ehh?

peace, both of you peace, if it were in real life right now, i'd just say peace _______ (<- your names go there) - it'd be quite an efficient way to address you both

[nacho]

Luffy is ashamed of his actions. In yet another vociferous pm:

Note to self: Remember that Raga is a complete idiot. (He will probably quote this as well)

admittedly they werent all of his words, but i only added this part:

"I hope you realise you have no chance of getting a 35+, and if you were able to somehow fluke this feat, I'll shave my ass, put a bag over my head, and let you walk me in public with a leash around my neck."

the rest is true

[luffy]

Luffy is ashamed of his actions. In yet another vociferous pm:

Note to self: Remember that Raga is a complete idiot. (He will probably quote this as well)

admittedly they werent all of his words, but i only added this part:

"I hope you realise you have no chance of getting a 35+, and if you were able to somehow fluke this feat, I'll shave my ass, put a bag over my head, and let you walk me in public with a leash around my neck."

the rest is true

Err - no, you made up a lot more than that!

Also, yes, my "idiot" statement was the only true derogatory statement made (between friends) and it clearly holds true. Why on earth would you waste peoples' time on this thread by creating false quotes?

[extcar]

would you lose marks for not rationalising

[nacho]

solve:
tan^2(x) + ( 1 - root(3))tan(x) = root(3)     for x E [0, 2pi]

my method:
(tan(x))^2 = tan(x)(1-root(3)) = root(3)
let tan(x) = a

a^2 + a-a(root(3)) - root(3) = 0

a(a+1) - root(3)(a+1) = 0
a(a+1) = root(3)(a+1)
therefore a = root(3)
tan(x) = root(3)
sin(x)/cos(x) = root(3)
...
x = pi/3 and 4pi/3

what have i done wrong/not enough?

actually wait! duh i forgot, or a = -1

but is my solution legitimate?
kilbaha solution have done it another method

[Panicmode]

solve:
tan^2(x) + ( 1 - root(3))tan(x) = root(3)     for x E [0, 2pi]

my method:
(tan(x))^2 = tan(x)(1-root(3)) = root(3)
let tan(x) = a

a^2 + a-a(root(3)) - root(3) = 0

a(a+1) - root(3)(a+1) = 0
a(a+1) = root(3)(a+1)
therefore a = root(3)
tan(x) = root(3)
sin(x)/cos(x) = root(3)
...
x = pi/3 and 4pi/3

what have i done wrong/not enough?

actually wait! duh i forgot, or a = -1

but is my solution legitimate?
kilbaha solution have done it another method

Did you get the same solution? I suppose Kilbaha probably used the quadratic method.

My answers were, x = pi/3, 3pi/4, 4pi/3, 7pi/4

I'll post a scan of my method here, just let me scan and upload...

I assume your solution is equally as valid. Did Kilbaha solve it the way I did?

[nacho]

nopes you solved it the way i did
except i forgot about u = -1

and that is an interesting way of factorising
i was always bad at factorising