H2 Maths 4.1 - Plotting Complex Numbers on the Argand Diagram

What you will learn

• Argand diagram: horizontal real axis, vertical imaginary axis; plot z = a + b i as the point (a, b).
• Example: z = 3 - 4 i sits at (3, -4) in the fourth quadrant; z = -1 + 2 i sits at (-1, 2) in the second quadrant.
• Conjugate z* = a - b i flips the sign of the imaginary part; on the diagram z* is the reflection of z in the real axis.