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27 December, 17:51

How do you solve this?

(5+i) (5+2i)

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Answers (1)
  1. 27 December, 21:13
    0
    23 + 15i

    Step-by-step explanation:

    Multiply the binomials in the usual way, then replace i² by - 1 and simplify.

    (5 + i) (5 + 2i) = (5) (5) + (5) (2i) + (i) (5) + (i) (2i) = 25 + 10i + 5i + 2i²

    = 25 + 15i + 2 (-1)

    = 23 + 15i
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