The expression 2i^2+3i^3 is equivalent to ?

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NOTE:- i^(2n) = (i^2)^n = (-1)^n ; where n = natural number

Thus i^2 = -1   &  i^3 = -1*i = -i

Hence 2i^2 + 3i^3 = (2*-1) + (3*-i) = -2 - 3i 

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