Question

Express the following in the form of a+ib state the values of a&b of the (1+2i)(-2+i)=7

Answer 1

Answer:

(1+2i)(-2+i)=7

-2+i-4i+2i²=7

-2-3i+2i²=7

-2-3i+2(-1)=7

-2-3i-2=7

-4-3i=7

-4-7-3i=0

-11-3i=0

hence, a=-11 and b=-3.

I hope it will help you.