Q4 of 29 Page 5

Multiply 4 - 3i by its conjugate.

Consider 4 – 3i,


Conjugate = 4 + 3i


So,


(4 – 3i) (4 + 3i) = 16 + 12i – 12i – 9i2


= 16 - 9i2


= 16 + 9


= 25


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