# complex Number

Discussion in 'Math' started by micro1, Apr 26, 2015.

1. ### micro1 Thread Starter Member

Feb 22, 2015
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it is my solution true?

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Apr 5, 2008
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Feb 22, 2015
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4. ### Papabravo Expert

Feb 24, 2006
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If |A| and |C| were colinear then the difference in their arguments would be 180°.

168.65° - (-71.34°) = 239.99°

Also |B| and |C| do not make the same angle with the real axis.

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Apr 5, 2008
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Hello,

Ok, having a closer look, you are right.
It is more common to use 16 ∠ 48.66° is stead of 16 ∠ -311.34°

Bertus

PS for me it is 40 years ago I had this stuff.

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6. ### studiot AAC Fanatic!

Nov 9, 2007
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micro1,
What don't you understand about the replies?

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7. ### Papabravo Expert

Feb 24, 2006
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Fine, turn it in and see what happens.

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8. ### joeyd999 AAC Fanatic!

Jun 6, 2011
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@Papabravo, @bertus:

You guys must be mind readers. I see a rough sketch of a graph of 3 vectors, A, B, and C followed by the question "Is my solution true?", but no assertion of which to determine the "truthfulness".

Is it the relationship between A, B, and C that he is inquiring about? Or just, "given A, B, and C, is this a correct graphical representation?" Without such an assertion, the original question is meaningless.

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9. ### Papabravo Expert

Feb 24, 2006
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You'll get no argument from me on that score. I made an assertion based on my assumptions, and was expecting a meaningful response.

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10. ### WBahn Moderator

Mar 31, 2012
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Solution to what?

If you are trying to plot those three vectors, then you have them in the right quadrants, but I would not say that they are close enough to be scored "correct". Is your A vector, as drawn, closer to the real axis or the negative imaginary axis. Which should it be closer to?

Similar question for your B vector.

Your C vector looks close enough to be at least roughly correct.

As already pointed out, your A and C vectors, as drawn, look to be collinear (allowing for the marked curvature in your C vector). Does that make sense?

Also, you need to give an indication of scale. There is no way to tell if your vectors are the correct length because you give no scale on your axes.

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