HSC 2013 Maths Marathon (archive) (1 Viewer)

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vilst3r

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Re: HSC 2013 2U Marathon

Alright good luck on 2 unit tomorrow, thanks for your help man
 

RealiseNothing

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Re: HSC 2013 2U Marathon

yeah i would love if someone helped with that, but what im thinking is, since its a cubic, only one side will continously increase, and so that root might be above the x axis?
A bit late but:

If you differentiate a cubic you get it's gradient function, in this case a quadratic. The function is always increasing if the gradient is never 0 (and it increases for at least one value of x and is continuous - just minor subtleties). So you find the value of 'k' such that the gradient is never 0, which is when the discriminant of the gradient function is negative, meaning it has no roots, thus it is never 0.
 

Smile12345

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Re: HSC 2013 2U Marathon

We need a 2U 2014 Thread...

Mods, could we/ I start a 2014 Thread??
 

photastic

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Re: HSC 2013 2U Marathon

The most hardest q16 question I have ever seen. Nah jokes, the biggest troll of a question to be placed near the end of the exam. Guys who sat the cssa this year, you would know this.

 

Carrotsticks

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Re: HSC 2013 2U Marathon

Just Pythagoras that thing up haha. Indeed a troll question if thrown at the end of the paper. I'm sure many student would have drawn a line from A to B, then called the intersection with the horizontal X or something.
 

Carrotsticks

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Re: HSC 2013 2U Marathon

Unless that was the solution that they were looking for, which would be very silly.
 

photastic

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Re: HSC 2013 2U Marathon

Another troll question. Show that 5 cents is half a dollar :p
 
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