Question

2+4i

What is the product?

Answer 1

i believe you are missing something

Answer 2

product? where are you multipliying?

Answer 3

Product=2 numbers multiplied.
We have,
2+4i only 1 complex number.
PARAMETERS MISSING.

Answer 4

BBB83 - are you trying to multiply 2 and 4i

Answer 5

Lol o.o but it's given 2+4i so I am not sure how that is correct.

Answer 6

(2+4i)(2-4i)
= 4 - 16i^2
= 4 + 16 = 20

Answer 7

sorry i forgot to add the complex conjugate 2-4i

Answer 8

That's how the complex number work, always go in pair!

Answer 9

(2+4i)(2-4i)
Which is same as,
(a+b)(a-b)
So,
\[a ^{2}-b ^{2}\]
Which is,
\[2^{2}-(4i)^{2}\]
4-(-16)
4+16=20