VCE Methods Question Thread!

[kx4y]

how to do these types of MCQ questions?

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Hope this helps!

[Camo15]

Why is the answer to this E and not A?

[Zealous]

how to do these types of MCQ questions?

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Why is the answer to this E and not A?

If you've got a polynomial in intercept form, if x=a is a zero, then (x-a) is a factor, not (x+a). The x-intercept is x=a (which means 'a' is a negative number), which will correspond to (x-a)³.

[Camo15]

If you've got a polynomial in intercept form, if x=a is a zero, then (x-a) is a factor, not (x+a). The x-intercept is x=a (which means 'a' is a negative number), which will correspond to (x-a)³.

Legend, cheers

[Rishi97]

EF is a vertical line. They have same x coordinate. Distance = y of E - y of F

Thanks but I'm still a bit confused :/
Why are you subtracting the equations to find the coordinate?
Any help appreciated!!!

[Jason12]

in "show that" questions where they give you the answer, are you allowed to use that answer in your working out to 'prove' that the answer is correct? E.g. if they give you p = 5/6 can you use p to prove that the answer is correct or must you find p on its own somehow.

[swagsxcboi]

in "show that" questions where they give you the answer, are you allowed to use that answer in your working out to 'prove' that the answer is correct? E.g. if they give you p = 5/6 can you use p to prove that the answer is correct or must you find p on its own somehow.

if they ask you to 'show that' then you should show it, usually by setting up your eqn or integral, etc.
afaik it's okay to solve the final line by cas, just make sure you set up everything by yourself and make it clear how you set it up

[faredcarsking123]

Quote from: faredcarsking123 on 5 hours  ago

2011 Exam 2 4f) Why do we want dT/dx to be less than or equal to zero?

Thanks



2011; At dT/dx=0, Tazzy will reach the plant at the minimum time. However, as the function is decreasing, when dT/dx<0, k won't return a local minimum but rather, an absolute minimum for the graph.

Really sorry guys i still don't get this



2011) Still dont understand how dt/dx < 0 gives the required info


very sorry if the answer is obvious, I cant see it

[Reus]

Thanks Jason12

[kx4y]

What does the 'sign' mean in an answer such as '2x-4sign(x)'?

[faredcarsking123]

I wanted to ask, in regards to the 2013 VCAA Maths Methods Exam Multiple Choice question 20, how do you get the answer A? I keep getting the answer for C and not A. Thanks!

I got caught here too

It says f to y=x^2, not y=x^2 to f

[RKTR]

Thanks but I'm still a bit confused :/
Why are you subtracting the equations to find the coordinate?
Any help appreciated!!!

let's say E is a point on y= 2x
F is a point on y=x^3

y coordinate of E will be 2x since y=2x
y coordinate of F will be x^3 since y=x^3

Therefore 2x-x^3 will be the distance since they have the same x

[Charismango3]

When we're asked to find the inverse function of f, how should we set up the domain. Can we just write f^-1(x)= _______, xE[/(_____)/] or do we have to write it specifically in function notation, as in f^-1: [/(_____)/] ---> R, _______

[Jason12]

What does the 'sign' mean in an answer such as '2x-4sign(x)'?

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.

[Charismango3]

Can any other method apart from trial and error be applied in question 3g) of VCAA Maths Methods Exam 2 Short Answer Section? Thanks