What is the product of 5-2i and 3-4i

Product means the sum of two things i. e. the product of 1 and 2 is 3 (1 + 2 = 3)

So the product of 5-2i and 3-4i is:

= 5-2i + 3-4i

= 8 - 6i < - This is the product (the answer to your question)

I'm going to go further though and find i

6i = 8

i = 8/6