Question

A) (5-4i)(3+6i)
B) (6+2i)(7-3i)

Answer 1

a) (5-4i)(3+6i) = 15+30i-12i+24i²  =>24i²+28i+15


b)(6+2i)(7-3i) = 42-18i+14i-6i² = -6i²-4i+42