1.

Express (2 – 3i)3 in the form (a + ib).

Answer»

We have, (2 – 3i)3

= 23 – 3 × 22 × 3i – 3 × 2 × (3i)2 – (3i)3

= 8 – 36i + 54 + 27i

= 46 - 9i.



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