Parametrics (1 Viewer)

[*zara*]

i need serious help with parametrics we've juz finished the topic and i dont undestand it at all the Q 'z are so long and i hate the way they word them it confuses me badly so for anyone whosz got tips out dere that can help me start to see the big picture plz i need it!!!!!!!!!!!!!!!!!!!
tannx

 

[mojako]

Big picture:
You're trying to combine two equations into one.
You use techniques such as substitution or addition of the two equations.

Example:
x=2at --(1)
y=at² --(2)
Express y in terms of x.
From (1) you have t=x/2a
Substitute this into (2):
y=a(x/2a)²
then just simplify / rearrange

 

[velox]

learn how to derive all the formulae. After that its pretty easy.

 

[Xayma]

Well you have to be able to derive all formula so you do not need to memorise them. They will (from all past papers I've seen) either get you to derive it or give it to you saying you do not need to prove it.

 

[velox]

But most of the questions are about deriving the formula. After deriving the equations most questions are not bad.

 

[acmilan]

Deriving the equations of normals, tangents etc usually are worth 1-2 marks and sometimes given. Normally they might ask in one section to find the x and y coordinates of a point, sometimes you can use these in finding the locus.

 

[velox]

Yeah after derving them u need to do something with them, i.e. use them in the next part of the question.

 

[mojako]

u need to know the standard cartesian form of a parabola.
u need to know the standard parametric form of a parabola (just in case.. normally they give it to you)
u need to know that for focal chord PQ, pq=-1

 

[velox]

and a lot more.......

 

[Estel]

moral: consult your textbook.

 

[wrong_turn]

my textbook is far too hard. like the teacher taught us the basics, then we went right into the heart of the topic.

we have the fitzpatrick book though.

 

[acmilan]

The beginning part of Fitzpatrick is not overly difficult, its not until the end that some questions become a bit obscure

 

[wrong_turn]

The beginning part of Fitzpatrick is not overly difficult, its not until the end that some questions become a bit obscure

look at the problem solving for 24(c). we got flung into it right after we did the theory?!

 

[*zara*]

thanx everyone...... wat i done was made my self sit down for 2 hours straight and tried to tyeach myself the basics then i started to understand it much more clearly and i found it pretty interesting until it got alot harder so i got a tutor and shes exellent better than my teacher and so im half way thru and understand it till now !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! its all good
thanx again

 

[currysauce]

i actually don't mind parametrics, + locus and parabolas (yr 12)... at first i hated them... but after about a week of full practice meh.... wat i do hate is all the formulas... such as normals intersect at such and such... lol...

but if u need help just pm me...

 

[Vampire]

The first few parametrics in fitzpatrick are pretty easy - towards the end they're tough