Respuesta :

sqdancefan

Answer:

  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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