Question

dado o numero complexo z=1+3i,o valor de z² é?
A)-8+6i
B)-6+8i
C)6-8i
D)8-6i
E)8+6i

Answer 1

z=(1+3i)
logo Z.Z = Z²
z² = (1+3i).(1+3i)
z² = 1+3i+3i + 3².(i)²
i² = -1
z² = 1+6i + 9.-1
z² = 1 + 6i - 9
z² = -8+6i