Question

Can someone help with this pls!! Thank u!

Answer 1

(a+bi)×(b+ai)

=>ab+a²i+b²i+abi²

=> ab+(-1)ab+(a²+b²)i

=>(a²+b²)i

Explanation:

Answer 2

(a+bi)×(b+ai)

=>ab+a²i+b²i+abi²

=> ab+(-1)ab+(a²+b²)i

=>(a²+b²)i

so we can say it is purely imaginary number

hope it helped!