1. COMPLEX NUMBERS
WJEC FP1 JUNE 2008
Remember

2. We will simplify each part in a similar way to simplifying SURDS in C1.
Remember

3. And part a is complete for 5 marks
becomes
Now collecting REAL and IMAGINARY parts
And part a is complete for 5 marks

4. In the ARGAND DIAGRAM we see that z is in the 3rd Quadrantim -3 -7
The MODULUS is the length of
the line drawn in the ARGAND DIAGRAM

5. Since the COMPLEX NUMBER is in the 3rd Quadrant The NEGATIVE ARGUMENT im
The ARGUMENT is the CLOCKWISE rotation
Between the REAL AXIS and the COMPLEX NUMBER
Since the COMPLEX NUMBER is in the 3rd Quadrant
The NEGATIVE ARGUMENT
is the ANTICLOCKWISE rotation
Between the REAL AXIS
and the COMPLEX NUMBER
ARG z =
Find Angle Or