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16 January, 04:20

Multiply (2 - 7i) (9 + 5i).

A) 53-53i

B) - 17-53i

C) 18-35i^2

D) 18-53i-36i^2

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Answers (1)
  1. 16 January, 04:41
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    (2-7i) (9+5i)

    18+10i-63i-35i^2

    i^2 = - 1 so - 35*-1 = 35

    35+18 = 53

    -63i+10i = - 53I

    answer is 53-53i
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