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July 10, 2025, 04:46:05 pm
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Author Topic: I broke maths.  (Read 15523 times)  Share 

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Hutchoo

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Re: I broke maths.
« Reply #30 on: April 13, 2011, 03:52:21 pm »
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Hi guys, I have another question.

It's quite simple, I just don't understand how my textbook got  :-\

This was my first step, assuming that one of the steps is wrong:


As you can see.. I just multiplied by the complex conjugate of 3+i but it's wrong. I'm assuming you can't make a conjugate of a conjugate or something.. (if that makes sense)? derpderpderderp. need moar sleep

Thankssssss.
« Last Edit: April 13, 2011, 04:07:56 pm by Hutchoo »
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luffy

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Re: I broke maths.
« Reply #31 on: April 13, 2011, 04:05:06 pm »
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Your first step is correct:
1.

2.

3.

4.

5.

6.

Simplifying the fraction to get:
7.

Hope I helped.

P.S. The conjugate of the conjugate should just be the original z values. Haha.
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Hutchoo

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Re: I broke maths.
« Reply #32 on: April 13, 2011, 04:07:09 pm »
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Oh, oops LOL. I forgot to simplify ROFL.
Okay, thanks man :)
<3

Yeahs. Thanks for making me notice xD.
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Hutchoo

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Re: I broke maths.
« Reply #33 on: April 13, 2011, 05:09:16 pm »
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Another quick question.

I get confused when finding the angle when putting stuff into polar form. 0.o

I can get the value of r, but I don't understand how to find the angle.. D:
My book isn't really good with its explanations.

All I can do right now is this:




Assuming that is the right method...
Thanks.
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vea

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Re: I broke maths.
« Reply #34 on: April 13, 2011, 05:11:48 pm »
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Use arctan(im part/re part) and adjust the angle according to the quadrant it is in. Remember to check that the angle you have is the principal argument though (-pi,pi]
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xZero

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Re: I broke maths.
« Reply #35 on: April 13, 2011, 05:13:53 pm »
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Hutchoo

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Re: I broke maths.
« Reply #36 on: April 13, 2011, 05:18:34 pm »
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Ohhhhhh.
Now that makes sense. Thanks xZero and vea :)
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Hutchoo

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Re: I broke maths.
« Reply #37 on: April 13, 2011, 05:42:28 pm »
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This is another question that relates to the one I just posted.

The question is:


Am I supposed to be able to graph this stuff in my head?
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xZero

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Re: I broke maths.
« Reply #38 on: April 13, 2011, 05:45:51 pm »
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well for most complex graphs you're suppose to know the general shape etc

but for , its just a dot with 1/4 as its real component and root3 on 4 as its imaginary component
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Hutchoo

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Re: I broke maths.
« Reply #39 on: April 13, 2011, 05:47:47 pm »
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How would you sketch sqrt3 on 4 in your head :/?
Some kinda trick?
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iNerd

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Re: I broke maths.
« Reply #40 on: April 13, 2011, 05:48:19 pm »
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Wtf is this...we're still on partial fractions :buck2:
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Greatness

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Re: I broke maths.
« Reply #41 on: April 13, 2011, 05:50:41 pm »
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Quote from: ATAR on April 13, 2011, 05:48:19 pm
Wtf is this...we're still on partial fractions :buck2:
Complex numbers
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xZero

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Re: I broke maths.
« Reply #42 on: April 13, 2011, 05:51:50 pm »
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Quote from: Hutchoo on April 13, 2011, 05:47:47 pm
How would you sketch sqrt3 on 4 in your head :/?
Some kinda trick?

ohh... I just approximate the it, or alternatively imagine a line with the angle matching the dot and put the dot on the line where the real component is 1/4
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iNerd

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Re: I broke maths.
« Reply #43 on: April 13, 2011, 05:53:19 pm »
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Quote from: swarley on April 13, 2011, 05:50:41 pm
Quote from: ATAR on April 13, 2011, 05:48:19 pm
Wtf is this...we're still on partial fractions :buck2:
Complex numbers
Thank god I won't have to experience such torture. Dropping this after the sem exam :)
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xZero

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Re: I broke maths.
« Reply #44 on: April 13, 2011, 05:54:53 pm »
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Quote from: ATAR on April 13, 2011, 05:53:19 pm
Quote from: swarley on April 13, 2011, 05:50:41 pm
Quote from: ATAR on April 13, 2011, 05:48:19 pm
Wtf is this...we're still on partial fractions :buck2:
Complex numbers
Thank god I won't have to experience such torture. Dropping this after the sem exam :)

what you mean torture? spesh is the most interesting/fun subject ever :D
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2009: Chinese SLA
2010: English, Maths method[45,A+ A+ A+], Specialist maths[44,A+,A,A+], Physics[40,A,A+,A+], Psychology Atar:94.75
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