z=(1+2i).(1-3i) +2i³ -i^5 -i^-1

z=1-3i+2i-6i² + 2i.i² -(i².i².i) -1/i *(i/i)

z= 1-i+6 - 2i -(i) - i/-1

z= 7-i -2i - i +i

z= -3i +7

p = √a²+b² =√(-3)²+7² = √58 ✓

2879>√