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Need help with this question, Q8a from 2010 CSSA Trial Paper: The quadratic equation x^2 - 4Ax +6B = 0 has two different real roots \alpha and \beta . i) Show that 2A^2 > 3B . ii) Find the range of values of B if the sum of the roots is equal to the product of the...

ii) By coordinate of the parabola i presume you mean the focus and directrix. The parabola y^{2} = 4ax is orientated along the x axis. The vertex, (-2,1) lies halfway between the focus and the directrix. In your case 4a = 8, therefore a, or the focal length, is 2, therefore the focus...

Sites for you to look up on this: http://www.alrc.gov.au/inquiries/privacy http://www.alrc.gov.au/news-media/privacy/australia-must-rewrite-privacy-laws-information-age http://www.alrc.gov.au/publications/report-108 - check out the headings down the right side of this page... Hope this helps

Yeah, I thought HSC was just open slather...use whatever method you want...ends justify the means. If a teacher doesn't know several methods to do a question then they shouldn't be marking the HSC!

What topic are you doing now? Does it have to be from that topic? Consider: effect of technology on privacy law bringing about the need for reform reform of consumer law to create a unified national response i.e. Competition and Consumer Act 2010 (Cwlth) EDIT: maybe also drug laws (don't know...

Have a look at http://www.codecogs.com/latex/eqneditor.php. You can start by using the buttons to work out what does what, and you can either save formula as a pic and attach or copy the code from the bottom and paste into these forums.

You may have already got this, but heres my latex practice. <a href="http://www.codecogs.com/eqnedit.php?latex=\text{Use ratio of intercepts formula, where in this case:}\\ \begin{align*} \text{For a)} \frac{AD}{DG} &= \frac{BE}{EH}\\ \\ \frac{x-8}{21.25} &= \frac{5}{x-4}\\ \\ \therefore...

A similar program is GeoGebra... http://www.geogebra.org/cms/en/installers Truly free, very easy to use...

Ok... didn't think about that one. Thanks.

Is there ever any point on a graph where f'(x) = 0 and f"(x) = 0 and it is not a horizontal inflexion point? In other words, is f'(x)=0, f"(x)=0 always a horizontal inflexion?? Thanks

Thought i'd better give the answer... Glog log log log log log...!!

ha ha, yeah, but only for sufficiently large values of 1!

What sound does a drowning mathematician make??

Another one, also a bit lame: There are three men on a train. One of them is an economist and one of them is a logician and one of them is a mathematician. And they have just crossed the border into Scotland and they see a brown cow standing in a field from the window of the train (and the cow...

Whole thread is hilarious but ^ is great! ROFL! Here's mine: (bit lame) Two statisticians are out hunting when one of them sees a duck. The first takes aim and shoots, but the bullet goes sailing past six inches too high. The second statistician also takes aim and shoots, but this time the...

Thanks for that, rep'd.

Ok, so you don't actually start with cos3x, but rather cos3x...?

G'day Can someone show me the steps to prove (cos3x) = (1/4(3cosx + cos3x))??? Thanks.

What if the text is identified as "song lyrics", as distinct from "song"??? Just asking cos i've got some good lyrics for RT and am a bit confused with the "don't do songs" advice.

Yeah, i've got that Schlenker book, i'll have a better look through it. Thanks for that info. Cheers