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Calculati: (1+i)(2+i)(3-i)

Răspuns :

Răspuns:

( 1 + i ) × ( 2 + i ) × ( 3 - i )

( 2 + i + 2i + i² ) × ( 3 - i )

( 2 + i + 2i - 1 ) × ( 3 - i )

( 1 + 3i ) × ( 3 - i )

3 - i + 9i - 3i²

3 - i + 9i - 3 × ( - 1 )

3 - i + 9i + 3

6 + 8i