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(2-i)^3 =________________(a) 2-3i(b) 8-i(c) 2-11i(d) 2+11iThis question was posed to me during an online interview.This is a very interesting question from Complex Numbers-2 topic in section Complex Numbers and Quadratic Equations of Mathematics – Class 11

Answer» RIGHT CHOICE is (c) 2-11i

Easy explanation: We KNOW, (a-b)^3 = a^3-b^3-3ab(a-b)

So, (2-i)^3 = 2^3-(i)^3-3(2)(i) (2-i)

= 8-(-i)-6i(2-i)

= 8+i-12i-6

= 2-11i.


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