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No, you're right (unless im a fool too). I assumed you were calculating the area of one side of the quadrilateral.

Really, who!?

Too easy :)

You will come to realise Fawun that a math question can be tackled in countless of ways, and answered correctly. It's just about finding the most efficient way. :) Personally I didn't use pythag but it could? work. Just briefly looking at the question I'm going to say that its invalid, but meh...

.. wow LOL. respect.

Whatt! I didn't get mine yet.. How'd you do?

Re: 2012 Year 9 &10 Mathematics Marathon Yes.

Re: 2012 Year 9 &10 Mathematics Marathon First line you made a typo. Second line is wrong. It is given that they are parallel, nothing more. Third is fine.

Who did the Australian Mathematics Competition this year? Can't wait for my result lol..

Re: 2012 Year 9 &10 Mathematics Marathon Hahahah

Re: 2012 Year 9 &10 Mathematics Marathon Yeah I just do the general shape and then make one point and label it (1,2) or something like that. So the markers know that it belongs to the graph 2/x. I guess you could just write 2/x at the end of the line.

Re: 2012 Year 9 &10 Mathematics Marathon He means 2/x by itself. And Fawun, I do that for every graph. Rough sketch and then put important points in.

Re: 2012 Year 9 &10 Mathematics Marathon Mhm :) and this thread has been taken over by Demento's test lol..

Re: 2012 Year 9 &10 Mathematics Marathon x^2 -8x +25 (x-4)^2 + 9 Therefore 4 is the axis of symmetry. Then you sub in x = 4 and you get the vertex to be (4,9).

Re: 2012 Year 9 &10 Mathematics Marathon Okay so x^2 + x + 2 = 0. You factorised this into (x+2)(x-1) = 0 This part is already wrong (it is the factorisation of x^2 + x - 2, which is not the question) I think this is what people have been trying to say?

Re: 2012 Year 9 &10 Mathematics Marathon Ah, minimum. Wasn't reading properly (sleep deprivation getting to me haha). In that case you do -b/2a for axis of symmetry and sub in for vertex. :) Edit: Fail whale, didn't even read it had to be done by completing the square. *Scroll down for new answer

Re: 2012 Year 9 &10 Mathematics Marathon Yeah looks like there is no solution.

Re: 2012 Year 9 &10 Mathematics Marathon Someone needs to compose a BoS math olympiad for years 9/10 :D heehehe

Re: 2012 Year 9 &10 Mathematics Marathon It doesn't say prove, it says explain why. This means it should refer to the definition of what a function is.

Re: 2012 Year 9 &10 Mathematics Marathon Ohh I thought you meant that sketch the equations TO find the points of intersection. My bad :S