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[SOLVED] How to graph complex number fractions

Raerin

Member
Oct 7, 2013
46
If I'm graphing (3+4i)/25, would the x-point be 3/25 and the y-point be 4i/25?
 

Sudharaka

Well-known member
MHB Math Helper
Feb 5, 2012
1,621
If I'm graphing (3+4i)/25, would the x-point be 3/25 and the y-point be 4i/25?
Hi Raerin, :)

If you are marking the complex number \(\frac{3}{25}+i\frac{4}{25}\) on a complex plane you will have your real numbers on the x-axis and your imaginary numbers on your y-axis. First you will have to find \(\frac{3}{25}\) on the x-axis, draw a vertical line through that point. Then find \(\frac{4}{25}\) on the y-axis and draw a horizontal line through that point. The point where these two lines intersect would represent the complex number \(\frac{3}{25}+i \frac{4}{25}\).
 

HallsofIvy

Well-known member
MHB Math Helper
Jan 29, 2012
1,151
If I'm graphing (3+4i)/25, would the x-point be 3/25 and the y-point be 4i/25?
No quite but almost. You are just saying it wrong. It not "x point" and "y point" but "x coordinate" and "y coordinate" of the single point representing the complex number.

The x coordinate is 3/25 and the y coordinate is 4/25 (NOT "4i/25": numbers on the graph, being distances on a line, are real, not imaginary).

In general, the point representing a+ bi is (a, b), with x coordinate a and y coordinate b.