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1 October, 09:18

Find the product of 3-4i and its conjugate.

Answers (1)
  1. 1 October, 10:07
    Remember that i²=-1

    the conjugate of a+bi is a-bi



    the conjugate is 3+4i


    (3-4i) (3+4i)

    hey, this looks familiar

    remember (a-b) (a+b) = a²-b²


    (3-4i) (3+4i) = (3) ² - (4i) ²=9 - (16i²) = 9-16 (-1) = 9+16=25

    the product is 25

    it's conjugate is 3+4i
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