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April 27, 2026, 10:05:37 pm
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Author Topic: VCE Methods Question Thread!  (Read 6060874 times)  Share 

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chocolatechipcookies

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Re: VCE Methods Question Thread!
« Reply #6615 on: November 03, 2014, 09:13:10 pm »
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So I got asked to do this:

"The rule for function h is h(x)=2x^3+1. Find a rule for the inverse function h^-1"

I worked it out and got the cube root of ((x-1)/2), but the answer included x∈R at the end
is it necessary to include the "x∈R" bit?
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chocolatechipcookies

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Re: VCE Methods Question Thread!
« Reply #6616 on: November 03, 2014, 09:14:01 pm »
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Quote from: Reus on November 03, 2014, 08:15:50 pm
Could someone please do b? Thanks.

Omg I literally just tried to do that question just then and I couldn't do it!
sorry I'm no help :(
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Reus

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Re: VCE Methods Question Thread!
« Reply #6617 on: November 03, 2014, 09:25:19 pm »
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Quote from: chocolatechipcookies on November 03, 2014, 09:14:01 pm
Omg I literally just tried to do that question just then and I couldn't do it!
sorry I'm no help :(
It's driving me crazy lol
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speedy

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Re: VCE Methods Question Thread!
« Reply #6618 on: November 03, 2014, 09:27:53 pm »
+1
Quote from: Reus on November 03, 2014, 08:15:50 pm
Could someone please do b? Thanks.

Hopefully this makes sense:
Spoiler

You can 'take out the negative' because it's to the power of -1
« Last Edit: November 03, 2014, 09:30:57 pm by speedy »
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althepal

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Re: VCE Methods Question Thread!
« Reply #6619 on: November 03, 2014, 09:29:09 pm »
+1
Assuming 1/m*loge(m/3) is the answer to part a.i. This is how I did it. Please please correct me if I'm wrong but I got m>3
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AngelWings

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Re: VCE Methods Question Thread!
« Reply #6620 on: November 03, 2014, 09:32:45 pm »
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Quote from: Reus on November 03, 2014, 08:15:50 pm
Could someone please do b? Thanks.

Oh, I've seen this one and forgotten where it was from. Remind me; which paper did you get this from?
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Reus

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Re: VCE Methods Question Thread!
« Reply #6621 on: November 03, 2014, 09:36:04 pm »
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Quote from: AngelWings on November 03, 2014, 09:32:45 pm
Oh, I've seen this one and forgotten where it was from. Remind me; which paper did you get this from?
2012 exam 1
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katiesaliba

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Re: VCE Methods Question Thread!
« Reply #6622 on: November 03, 2014, 09:41:18 pm »
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Will getting B+/Bs on exams 1 and 2 get me a 25?
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Phy124

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Re: VCE Methods Question Thread!
« Reply #6623 on: November 03, 2014, 09:53:52 pm »
+1
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sparksfly

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Re: VCE Methods Question Thread!
« Reply #6624 on: November 03, 2014, 10:17:39 pm »
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Hey  :)

When writing the answer for the value in which the graph is strictly increasing, is it square brackets for the turning point, even though the gradient here is zero?

Thanks!
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Reus

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Re: VCE Methods Question Thread!
« Reply #6625 on: November 03, 2014, 10:39:29 pm »
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AngelWings

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Re: VCE Methods Question Thread!
« Reply #6626 on: November 03, 2014, 10:47:09 pm »
+1
Quote from: sparksfly on November 03, 2014, 10:17:39 pm
Hey  :)

When writing the answer for the value in which the graph is strictly increasing, is it square brackets for the turning point, even though the gradient here is zero?

Thanks!

Hi! Someone - and I can't remember who - posted this not too long ago.
https://www.youtube.com/watch?v=1mW6pOq7CsI
That link may solve a couple of your 'strictly increasing' problems.
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soNasty

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Re: VCE Methods Question Thread!
« Reply #6627 on: November 03, 2014, 10:48:20 pm »
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Is there a way to solve this algebraically?

I let

wouldn't the second equation to solve simultaneously be ?
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keltingmeith

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Re: VCE Methods Question Thread!
« Reply #6628 on: November 03, 2014, 10:50:25 pm »
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Quote from: soNasty on November 03, 2014, 10:48:20 pm
Is there a way to solve this algebraically?
(Image removed from quote.)
I let

wouldn't the second equation to solve simultaneously be ?

You've just said that 27=72, as p+q=1.
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soNasty

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Re: VCE Methods Question Thread!
« Reply #6629 on: November 03, 2014, 10:54:39 pm »
+1
OMG LOL
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