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9 September, 20:54

If f (x) = x^3-2x^2 which expression is equivalent to f (i)

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  1. 9 September, 21:21
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    Remember that

    i^2=-1 so

    f (i) = i^3-2i^2

    i^3=i^2 times i=-1 times i=-i

    2i^2=2 (i^2) = 2 (-1) = - 2

    f (i) = - i - (-2)

    f (i) = - i+2

    answer is - i+2 or 2-i
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