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VCE Methods Question Thread!

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PizzaMaster:
Hi guys
If a question says:
Write the answer in nearest cm, when the units are in metres.
Does to the "nearest cm" mean to write the answer in cm or could it be metres .(decimal) -- cm.
For example something like:
Y = x-1
Where x in metres
But then the answer says to "nearest cm"
can I write, for example, 3.45 metres
where the .45 is the "nearest cm"?

Thank you!

james.358:

--- Quote from: PizzaMaster on July 06, 2022, 05:22:44 pm ---can I write, for example, 3.45 metres
where the .45 is the "nearest cm"?

--- End quote ---

Yep! This is exactly how you should do it. I know it might seem confusing, but it is the equivalent of the question asking you to "give your answers correct to 2 decimal places, in meters"

ihavenolife:(:
Hey guys

Needed some help with this question

a) Find the derivative of x2ekx

b) Hence find an anti-derivative of xekx


I tried using Integration by Recognition on this question, since this is the only method my teacher will teach, but could never get the right answer. I sorta got stuck in a loop where to find one of the integrals I needed to find the integral of the other one.

Was wondering if any of you guys knew how to do it?

Thanks

1729:

--- Quote from: ihavenolife:( on July 07, 2022, 06:41:11 pm ---Hey guys

Needed some help with this question

a) Find the derivative of x2ekx

b) Hence find an anti-derivative of xekx


I tried using Integration by Recognition on this question, since this is the only method my teacher will teach, but could never get the right answer. I sorta got stuck in a loop where to find one of the integrals I needed to find the integral of the other one.

Was wondering if any of you guys knew how to do it?

Thanks

--- End quote ---
Hi, ialsohavenolife!  8)

Thank you very much for posting your working out, and good job on attempting the question!

As far as I can see, there is absolutely no issue with your working out and it's actually unsolvable in the scope of VCE Methods.

To be able to solve this you would need to know what \(\int \:x^2e^{kx}dx\), which you do not know (as you pointed out).

EDIT: Response below is better, and is in the scope of methods, however, the question mentioned 'hence' which is why I didn't go with that approach, although it's valid.

hvo-ade:
That's how I did it. But it should not be in the study design for MM and even it posed a tricky question for Specialist. Maybe next year when proof would have more weight in the new SD.

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