Maths Methods 3/4 Help Thread 2011

[BlueSky_3]

Really?  . Interesting.

[ech_93]

Probably a stupid question, but not sure how to do this....
Write (3x-1)/(x+1) in the form a/(x+1) +b.

[REBORN]

-4/(x+1)      +3

Long divide?

[ech_93]

Err, I'm an idiot. Thanks!

[tony3272]

If they're the same degree then i prefer this method:

[nacho]

do we need to know point of inflections in methods?
And the definition/formula of velocity and acceleration?

[david10d]

1. yes, why wouldn't we..
2. no i don't think it's compulsory but it may be good to know the definition for it. it's more spesh related

[paulsterio]

do we need to know point of inflections in methods?
And the definition/formula of velocity and acceleration?

1. yes, why wouldn't we..
2. no i don't think it's compulsory but it may be good to know the definition for it. it's more spesh related

1. No, you actually don't need to know what non-stationary points of inflection are (i.e. when the second derivative = 0, that's in spesh, not methods)
2. Not really, but you should know that when you differentiate displacement, you get velocity, differentiate velocity, you get acceleration, and obviously the reverse (i.e. integration to go backwards)

[david10d]

i don't think he means the second derivative.

POI with a derivative table you definitely need to know.

[nacho]

i not quite sure what it is,
ive just seen it come up in multiple choice.
eg:
The following graph has a what:
A. local min at x =a
B. local max at x = a
C. point of inflection at x = a
D. stationary point of inflection at x = a
E. negative gradient at x= a

[Greatness]

i not quite sure what it is,
ive just seen it come up in multiple choice.
eg:
The following graph has a what:
A. local min at x =a
B. local max at x = a
C. point of inflection at x = a
D. stationary point of inflection at x = a
E. negative gradient at x= a

Was this a vcaa exam?
In methods just treat points of infections as 'stationary points of infection'

[kefoo]

f(x) = 1/x^2
It's been dilated by factor of 2 from y-axis
i forgot all my transformations so if someone can help meee

[REBORN]

4/x^2 I think?

Use matrix and you get x' = x/2 and y' = y

[kefoo]

4/x^2 I think?

Use matrix and you get x' = x/2 and y' = y

when i use matrix and it says from y-axis, i put the number at the bottom right xd

[REBORN]

factor of k from the y-axis...don't you put it in the top left?