Numbers on a complex plane

  • Thread starter tg22542
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  • #1
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Homework Statement



Graph the following numbers on a complex plane.

A) 3-2i
B)-4
C)-2+i
D)-3i
D)-1-4i

Can smomeone help me how to get started on this question? I'm not sure what it wants me to do
 

Answers and Replies

  • #2
SteamKing
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First, find out what the complex plane looks like. (Hint: it looks just like a regular plane, except the y values are -4i, -3i, ..., 3i, 4i.

Plot A) thru B) from the OP and label the points.

Your work with complex numbers will get MUCH harder from this point.
 
  • #3
HallsofIvy
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Do you know how to plot (3, -2) on a graph?
 
  • #4
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So use an xaxis of -4i to 4i and a y axis of -1 to 3 then simply plot them?
 
  • #5
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Homework Statement



Graph the following numbers on a complex plane.

A) 3-2i
B)-4
C)-2+i
D)-3i
D)-1-4i

Can smomeone help me how to get started on this question? I'm not sure what it wants me to do

The instructions are pretty clear to me -
Graph the following numbers on a complex plane.
Have you looked in your book? It should have several examples of graphing complex numbers.
 
  • #6
Mentallic
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So use an xaxis of -4i to 4i and a y axis of -1 to 3 then simply plot them?

No, you have your axes the wrong way around. The x-axis corresponds to the real numbers, and the y-axis to the imaginary numbers. To plot a number [itex]z = a+ib[/itex], you plot (a,b) and you label your real axis (x-axis) as Re(z) and your imaginary axis as Im(z).

Also note that [itex]a = a+i0[/itex] and [itex]ib=0+ib[/itex]
 

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