Respuesta :

[tex]3i(6+2i) = 18i+6i^2 = 6i(3+i)[/tex] if i is a variable

[tex]3i(6+2i) = 18i+6i^2=18i+6(-1) = -6+18i = 6(-1+3i)[/tex] if i is the imaginary unit defined by i²=-1