VCE Methods Question Thread!

[Sine]

could you please explain this part again. I dont fully understand. I kind of understand but want it to be elaborated please.

It is kind of like having two functions which at different values of a & b are different x values for the S.P but at some values they(the functions) intersect and therefore have the same value thus there is 1 solution.(because both equations for the S.P equal the same x-value)

[Sine]

i see, its like a reverse way of thinking.

Say i was setting up related rates of change equation i.e. dh/dt = dh/dv etc.... , would i input the rate as a negative for dv/dt? i.e. dv/dt = -6 ?

Yes, because Volume is decreasing.

[cameotodd]

Hey can someone help me out with the following questions ? thanks

[garytheasian]

not sure how to do c and d

[Floatzel98]

not sure how to do c and d

I tried doing c myself, but i wasn't getting the answer right either, so i looked it up in the worked solutions, and apparently you actually have to integrate it to work it out. It makes sense once you find out you have to do that, but it seems a bit weird seeing how we haven't technically been introduced to integration at this point. I don't know if this is the actual method or if there is an easier way, more related to the chapter. Hopefully the integration hint should be enough for you to work it out, or someone else can show you how to do it 'properly'. \

For d, you can keep testing the weeks after week 4 and then find out when it starts decreasing, probably. When you start getting negative rates the plant will begin to decrease its area and then eventually, from the model, will start reaching negative area.

[Sundal]

To find the inverse of this function:  [ (4-x^2) ]^0.5

would you just say it is x^2 + y^2 = 4, and then restrict the domain accordingly, since doing the algebra itself gives a full circle and that is not what we are after...

[garytheasian]

I tried doing c myself, but i wasn't getting the answer right either, so i looked it up in the worked solutions, and apparently you actually have to integrate it to work it out. It makes sense once you find out you have to do that, but it seems a bit weird seeing how we haven't technically been introduced to integration at this point. I don't know if this is the actual method or if there is an easier way, more related to the chapter. Hopefully the integration hint should be enough for you to work it out, or someone else can show you how to do it 'properly'. \

For d, you can keep testing the weeks after week 4 and then find out when it starts decreasing, probably. When you start getting negative rates the plant will begin to decrease its area and then eventually, from the model, will start reaching negative area.

I was thinking i need to apply integration but surely there is another way considering its part of the differentiation chapter only. Furthermore the book doesnt even provide an answer for 6 which is rather strange and extremely annoying...

[Floatzel98]

I was thinking i need to apply integration but surely there is another way considering its part of the differentiation chapter only. Furthermore the book doesnt even provide an answer for 6 which is rather strange and extremely annoying...

Yeah, it definitely is weird, hopefully someone else can help with it. Also, do you mean question 6 in the extended response, or did you mean d) from 17? The answer from the worked solution is below, if it helps at all.

Spoiler

[garytheasian]

Yeah, it definitely is weird, hopefully someone else can help with it. Also, do you mean question 6 in the extended response, or did you mean d) from 17? The answer from the worked solution is below, if it helps at all.

Spoiler

yes i meant d woops my bad

[knightrider]

How would you guys go about sketching trig graphs with translations in it.

In particular horizontal translations for trig functions.

i find these very confusing when graphs have both horizontal and vertical translations.

How would you guys go about drawing these.

Any tips.

Thanks 

[knightrider]

How can you tell if a graph is symmetrical?

What information can we gain if we know a graph is symmetrical?

[Apink!]

Hi everyone,
If I had this graph, (attached as a picture) what would be its possible domain?
btw, this function describes a volume function (it's an application function)
Apparently, the answer is meant to be o<x<6.28  But I don't understand why

Thank you so mcuh

[knightrider]

How can you tell if a graph is symmetrical?

What information can we gain if we know a graph is symmetrical?

Anyone ?

Thanks 

[Gentoo]

You can tell a graph is symmetrical if f(x) = f(-x). (also f(|x|) = f(x) for all real values of x)

As for what information you can glean from that... it's an even function, I guess?

[knightrider]

You can tell a graph is symmetrical if f(x) = f(-x). (also f(|x|) = f(x) for all real values of x)

As for what information you can glean from that... it's an even function, I guess?

Thanks Gentoo