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Homework Help: Numbers on a complex plane

  1. Jun 12, 2013 #1
    1. The problem statement, all variables and given/known data

    Graph the following numbers on a complex plane.

    A) 3-2i

    Can smomeone help me how to get started on this question? I'm not sure what it wants me to do
  2. jcsd
  3. Jun 12, 2013 #2


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    Staff Emeritus
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    Homework Helper

    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.
  4. Jun 12, 2013 #3


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    Do you know how to plot (3, -2) on a graph?
  5. Jun 12, 2013 #4
    So use an xaxis of -4i to 4i and a y axis of -1 to 3 then simply plot them?
  6. Jun 12, 2013 #5


    Staff: Mentor

    The instructions are pretty clear to me -
    Have you looked in your book? It should have several examples of graphing complex numbers.
  7. Jun 12, 2013 #6


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    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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