VCE Methods Question Thread!

[Mieow]

In the 2013 exam question 4 d.ii,
how come the minimum area is the endpoint k=8?

[Jason12]

a stupid question but if c < -8 is it going further away from 0 and if c is > -3 is it going closer to 0?

[lzxnl]

I think it means that it can be +ve or -ve at the same time. You usually get it when you try to derive a modulus function on CAS so instead you have to split the modulus function into a hybrid function.

Nope. sign(x) means |x|/x. In other words, it's 1 if x>0, -1 if x<0 and undefined if x=0.

In the 2013 exam question 4 d.ii,
how come the minimum area is the endpoint k=8?

Presumably because the function is decreasing over the interval so that it's smallest at the right endpoint.

[speedy]

Quickly, if anyone is there -> for 2013 transformation question, why do we multiply by k and m and not divide?

[paper-back]

When we have to find the distance from a velocity graph,
E.g. Lets say someone drives to work with the velocity function v(t), what is the distance covered in 30 minutes?
What's the difference between finding the integral for a specific set of terminals, in this case 0 to 30
and, finding the distance equation then subbing in t=30?

And what if the situation is one in which someone is painting a wall with the speed v(t), and it asks what area he covers?

Thanks for answering

[paper-back]

Quickly, if anyone is there -> for 2013 transformation question, why do we multiply by k and m and not divide?

It's the translation of co-ordinates
So (x,y)-> undergoes a dilation of k and m -> (mx,ky)

[speedy]

It's the translation of co-ordinates
So (x,y)-> undergoes a dilation of k and m -> (mx,ky)

Alright, so the new equation is still: y' = ksin(x'/m) ?

[Reus]

how do you know when to answer in exact or approx
when it doesnt state which?

[speedy]

how do you know when to answer in exact or approx
when it doesnt state which?

exact

[paper-back]

Alright, so the new equation is still: y' = ksin(x'/m) ?

Yeah, we just don't use the whole new equation for that question

[Reus]

exact

How do you get exact values for intercepts of a graph on a calculator?

[Orb]

How do you get exact values for intercepts of a graph on a calculator?

Solve that equation = 0 for x-intercept

Or sub that equation with x=0 for y-intercept

[Zues]

anyone know if the heinnamann maths zone text book for methods 3/4 is good. most schools seem to use math quest and essentials so im a bit worried with our schools decision (i know all have same stuff *basically*) but would like some feedback!
thanks

[theshunpo]

anyone know if the heinnamann maths zone text book for methods 3/4 is good. most schools seem to use math quest and essentials so im a bit worried with our schools decision (i know all have same stuff *basically*) but would like some feedback!
thanks

Check out pi's Generalised Textbook Summaries that should help you out!

[Mieow]

anyone know if the heinnamann maths zone text book for methods 3/4 is good. most schools seem to use math quest and essentials so im a bit worried with our schools decision (i know all have same stuff *basically*) but would like some feedback!
thanks

My school used Heinnemann too but I also self-studied using the Essentials textbook. In my humble opinion Heinemann goes over the most BASIC of BASIC concepts. It doesn't really challenge your understanding of the concepts and it can be really repetitive at times. Personally, I'd only recommend using Heinemann if you're struggling with something and need to go back to basics to get some sort of foundation on it.