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July 23, 2026, 05:08:36 pm
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Author Topic: new question thread  (Read 4134 times)  Share 

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sachinmachin

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new question thread
« on: October 18, 2009, 03:51:59 pm »
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Show that can be represented by the cartesian equation
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Hooligan

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Re: new question thread
« Reply #1 on: October 18, 2009, 04:27:18 pm »
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Hmmm... this is a tough question, indeed...

I just tried it, but then I get stuck at the bit where the right side has a . It seems to be the bit which causes the problem... I'm not sure how to get rid of it...

*is also interested how to get the answer*  :D
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TrueTears

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Re: new question thread
« Reply #2 on: October 18, 2009, 05:01:26 pm »
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Hint: to get rid of the i.
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/0

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Re: new question thread
« Reply #3 on: October 18, 2009, 05:10:56 pm »
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must always be zero, mustn't it? Because the LHS is real... so the RHS must have no imaginary component.

Then









So the point is ???
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kamil9876

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Re: new question thread
« Reply #4 on: October 18, 2009, 05:12:24 pm »
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yes /0 I agree and was saying the same thing. Maybe typo perhaps?
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Voltaire: "There is an astonishing imagination even in the science of mathematics ... We repeat, there is far more imagination in the head of Archimedes than in that of Homer."

TrueTears

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Re: new question thread
« Reply #5 on: October 18, 2009, 05:13:33 pm »
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But funny thing is if you solve on the TI-89 you get an ellipse equation?  :uglystupid2:
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/0

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Re: new question thread
« Reply #6 on: October 18, 2009, 05:18:21 pm »
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Hmm.... yeah that's weird... but then you could also say like

because
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TrueTears

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Re: new question thread
« Reply #7 on: October 18, 2009, 05:19:30 pm »
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Quote from: /0 on October 18, 2009, 05:18:21 pm
Hmm.... yeah that's weird... but then you could also say like

because
Yeah... lol I try solving it by hand and I get a line, but on the calc you get an ellipse interesting...
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kamil9876

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Re: new question thread
« Reply #8 on: October 18, 2009, 05:35:45 pm »
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just like

(1)




so is a solution to (1)


Be careful of converses, kids.

modding both sides is not reversible, just like squaring.
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Voltaire: "There is an astonishing imagination even in the science of mathematics ... We repeat, there is far more imagination in the head of Archimedes than in that of Homer."

sachinmachin

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Re: new question thread
« Reply #9 on: October 18, 2009, 05:45:02 pm »
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LOL...so funny..
cant believe this question is more difficuilt as it seems. i got it from practice exam 2 of the neap smartstudy guide and exam revision book. there working out is confusing at best. i got an elliptical equation, however could not prove it to be the correct one. i will post the correct solution in a short while.
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dino

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Re: new question thread
« Reply #10 on: October 18, 2009, 08:43:48 pm »
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I've tried a few things, but no idea. Hmm...

I'd be interested to see the solution. I'm sure it'll be confusing. =P
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Hooligan

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Re: new question thread
« Reply #11 on: October 18, 2009, 10:01:55 pm »
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I have this book as well, and I found the question you are talking about.
You have incorrectly typed the question...  :o the question is actually:


I did the question again, after finding out the correct version of the question, and came to the correct answer. Wasn't as hard as it was first perceived due to the typo. =P When I looked at the working of the book, compared to mine, it is practically the same... I don't think there is any other way of doing... however, if you still have trouble with the book's working, feel free to ask. :)
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sachinmachin

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Re: new question thread
« Reply #12 on: October 18, 2009, 11:06:20 pm »
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lol...
so sorry guyz!! the typo threw you guyz off..
yeh didnt understand the books solutions..
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Hooligan

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Re: new question thread
« Reply #13 on: October 19, 2009, 05:16:25 pm »
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Quote from: sachinmachin on October 18, 2009, 11:06:20 pm
lol...
so sorry guyz!! the typo threw you guyz off..
yeh didnt understand the books solutions..

Oh okay... which bit of it? >.<
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sachinmachin

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Re: new question thread
« Reply #14 on: October 19, 2009, 08:38:04 pm »
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uhh....the 8(x^2+y^2)^1/2  bit
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