What complex number is represented by the expression 7i5 + 9i8?

Question

What complex number is represented by the expression 7i5 + 9i8?

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Thạch Thảo 5 months 2021-08-28T11:12:31+00:00 1 Answers 3 views 0

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    2021-08-28T11:14:30+00:00

    9514 1404 393

    Answer:

      9 +7i

    Step-by-step explanation:

    i^2 = -1, so i^8 = (-1)^4 = 1, and i^5 = (-1)^2×i = i

    Then …

      7i^5 +9i^8 = 7i +9 = 9 +7i

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