Question

05) O valor de ( 2 - 3i)² é: *


a) 5 + 12i

b) - 5 -12i

c) -5 + 12i

d) 5 - 12i​

Answer 1

(2-3i)²

2²-2.2.3i+3²i²

4-12i+9.(-1)

4-12i-9

-5-12i

Alternativa b)

Espero ter ajudado!

Answer 2

(2 − 3i)² = 2² − 2 ⋅ 2 ⋅ 3i + (3i)²

(2 − 3i)² = 4 − 12i + 9i²

(2 − 3i)² = 4 − 12i − 9

(2 − 3i)² = −5 − 12i