Question

(D) The value of i-91

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Answer 1

Answer:

=91

step by step explanation

Answer 2

Answer:

$-1/i$

Step-by-step explanation:

$Since \: (i^-4)=1. \: (i^-4=(1/i^4)=1/1=1) \\ We \: can \: write \: the \: equation \: as:- \\ (i^-4)^22 × i^-3. \\ =i^-3 \\=1/i^3. \\ We \: know \: that \: i^2=-1. \\ Hence \: answer \: becomes \\ =-1/i$

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