Question

Answer it guysss..I ll mark as brainliest if it's helpfull to me..​

Answer 1

Answer:

(1) (1+2i)(-2+i)

= -2 + i -4i + 2i²

=-2 -2 -3i

= -4 -3i

In a+ib form (-4)+i(-3)

a= -4

b= -3

(2)(1+i)(1-i)^-1

$= (1 + i) \frac{1}{(1 - i)}$