Q. 11
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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