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7 December, 18:08

If f (x) = x² + x - 4, evaluate f (2i).

Can anyone show a step by step process to get the answer?

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Answers (1)
  1. 7 December, 21:42
    0
    -6+2i

    Step-by-step explanation:

    f (2i) = 2i^2+2i-4

    2i^2 is - 2 because i^2 is-1, times 2 is - 2.

    Therefore, the equation becomes - 2+2i-4, leaving the answer of - 6+2i.
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