Question

Solve this complex no. And represent in the form of a+ib

Question :- 3( 7 + i7) + i( 7 + i7 )

Answer 1

Hey there!!!


Please refer to the given attachment..



Hope it will help you..☺️

Answer 2

3(7+i7) + i(7+i7)
=21 + i.21 + i.7 + i^2.7
=21 + i.28 + (-1).7
=21 + i.28 - 7
=14 + i.28

So, a = 14
b = 28.
Hence,
3(7+i7) + i(7+i7) = 14 + i.28