It is clear that some method of visualising complex numbers would be useful. The German mathematician Carl Fredrich Gauss (1777 – 1855) proposed the Argand diagram. This has the real numbers on the x-axis and the imaginary ones on the y-axis. All complex numbers can be plotted and are usually called z1, z2 etc.
Example 2:
Draw an Argand Diagram and plot z1(2 + 4i); z2(–2 –4i); z3(4 + 0i); z4(–3 + 0i); z5(–3 + 2i)
Im z1 4 z5
1 2 3
z4 -3 -2 -1
-3 -2 -1
z2 -4 The modulus of a complex number |z| is the distance from the point to the origin. zx y =+ Example 3: