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5 July, 18:15

If f (x) = x3 - 2x2, which expression is equivalent to f (i) ?

-2 + i

-2 - i

2 + i

2 - I

+1
Answers (1)
  1. 5 July, 21:48
    0
    The answer is

    f (x) = x3 - 2x2

    so f (i) = i^3 - 2i²

    i²=-1

    i^3=ixi²=-i

    f (i) = i^3 - 2i²=-i-2x-1=-i+2

    the answer is a. f (i) = - 2 + i
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