Question

(1+2i)(-2+i) express the following in the form of a+ib,a,b€Ri=√-1​

Answer 1

Answer:

-3i

or

0-3i

Step-by-step explanation:

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

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

=(-2+i)+(-4i+2i^2)

=-2+i-4i+2(-1)

=-2-3i-2

=0-3i

hope it's correct.... :)