VCE Methods Question Thread!

[hawkrook]

Suppose there's a function f(x). How would you express each of the following transformations in words using the terms dilation, translation and reflection?

f(2x)

f(-x)

2f(x)

-f(x)

f(x+5)

[Sine]

Could someone please help me with Qn 1fi from VCAA 2013 Exam 2

Thanks

for Question 2 (h) of the VCAA 2014 exam I dont understand where the marking scheme gets the terminals for the integral?

They used some manipulation of the differential equation. Also in 2(d) you find that the height is 6/(3rd root of pi) in addition to the earlier statement the statue is 1 m tall.

Suppose there's a function f(x). How would you express each of the following transformations in words using the terms dilation, translation and reflection?

f(2x)

f(-x)

2f(x)

-f(x)

f(x+5)

f(2x) : dilation factor 1/2 from the y-axis
f(-x): reflection in the y - axis
2f(x): dilation factor 1/2 from x-axis
-f(x): reflection in the x-axis
f(x+5): translation 5 untis in the negative direction of the x-axis

[minhalgill]

can someone please help me with 2010 question 4 (f)?

also, for 2011 Q4(f) why do we equate dt/dx to less than or equal to 0? why not just equal to 0? why can it be less than 0?

[melaniethephan]

Are we meant to complete the Methods 1 and 2 exam in pencil or pen? My teacher didn't tell us what we were supposed to use. 

[Sine]

Are we meant to complete the Methods 1 and 2 exam in pencil or pen? My teacher didn't tell us what we were supposed to use. 

Both pen or pencil are fine.

[melaniethephan]

Both pen or pencil is fine.

Thank you for replying so fast (: So they won't get upset if we use pencil? I'm not 100% confident with writing in pen so that's a relief

[Sine]

Thank you for replying so fast (: So they won't get upset if we use pencil? I'm not 100% confident with writing in pen so that's a relief

Nah, I used pencils in all my maths exams and recieved Study scores.

I don't think many people would be confident using pen over the whole exam

[minhalgill]

can anyone please help me with part f? i dont get how we find the coordinates of c?

2008 methods exam 2, question 3

[Robot10]

can anyone please help me with part f? i dont get how we find the coordinates of c?

2008 methods exam 2, question 3

The x coordinate of c is 1 as can be seen by the diagram. B is (1,8) so there is 8 Units of the antidote at the end of day 1. TJ then takes another capsule containing 16 Units of antidote. So the 8units that remains in his body+ the 16 Units he takes= 24 Units. Hence (1,24)

Thanks but how do you get XP= sq(3)/2

[Sine]

Thanks but how do you get XP= sq(3)/2

From the diagram on pg 14 of the exam. The coordinate P is (2pi/3, root3/2) and X is directly below it and lies on the x-axis hence XP = the y-coordinate = root3/2

[minhalgill]

can someone please help me with part (a(i))?

thanks in advance

[fruitbowl34]

Can anyone help me with this question from 2016 exam 1?? Probability is my weak point and I'm so confused!! Thanks!

[Sine]

Can anyone help me with this question from 2016 exam 1?? Probability is my weak point and I'm so confused!! Thanks!

Which aspect are you confused with?
I'll start off with the first quesiton to see if it can help you with the others.

[fruitbowl34]

Which aspect are you confused with?
I'll start off with the first quesiton to see if it can help you with the others.

I usually get confused with how to approach probability questions, but I understand your explanation! So for the second part would it just be 1-16/81 ? and is the third part (2/3)^6 ?

[Freddie Hg]

can someone please explain question 20 of the nht methods exam, i equated the deravitive to 0 and found x=(1-a)^1/2, i got this value and equated it less than or equal to two, as the last possible turning point has to be at 2. but i dont get the answer?? can anyone help?