????

what is the product of (3-4i) and (7-3i)?

 

\((3-4i)(7-3i)\\ =3(7-3i) -4i(7-3i)\\ =21-9i -28i+12i^2\\ =21-37i+\;\;\;\;12*-1\\ =21-37i\;\;\;\;-12\\ =9-37i\\\)