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10 June, 21:42

Simplify the expression (3 + 7i) (3 - 7i).

A. 40

B. 58

C. 9 - 21i

D. 9 + 21i

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Answers (1)
  1. 10 June, 21:53
    0
    B. 58 is your answer.

    Step-by-step explanation:

    (3 + 7i) (3 - 7i)

    9 + 21i - 21i - 49i^2

    The 21i and - 21i cancel out.

    9-49i^2 The i^2 becomes - 1

    9-49 (-1)

    9+49

    B. 58 is your answer.
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