Question

5. Se z = 4 + 2i, então o valor de z - 3z ̅ é:
a) 6 + i
b) 1 + 8i
c) –8 + 8i
d) 1 – 8i
e) 12 + 6i

Answer 1

$z = 4 + 2i  z^{-} = 4-2i  4+2i-3(4-2i) = 4+2i-(12-6i) = 4+2i-12+6i = -8+8i$

letra C)