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November 01, 2025, 03:15:52 pm
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Author Topic: Neap 2007 question  (Read 605 times)  Share 

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qwertyda2nd

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Neap 2007 question
« on: October 13, 2010, 07:41:55 pm »
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Hi everyone, this question from Neap 07, attached, the answer says B. I got A.
The way i did it was work out (x+iy)^2 and the Imaginary part of that is 2xy, so 2xy>4, so if x<0 then y<2/x, and if x>0 then y>2/x.
So is the answer wrong or is my understanding?
Thanks :)
« Last Edit: October 13, 2010, 07:43:53 pm by qwertyda2nd »
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Martoman

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Re: Neap 2007 question
« Reply #1 on: October 13, 2010, 08:00:43 pm »
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Yeah they're wrong. You're reasoning is the exact same as mine. Also, test a point say (-2,-3) this means -3 < 2/-2  -3<-1 this makes sense. Not  say (-1,-1) as in their region.
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