Simplify and write in standard form.

Question

1.)
(radical 3 + i radical 15)(radical 3 - i radical 15)

2.)
8 + 16i / 2i

Thanks again everyone. Any help is appreciated.

Answer 1

1.
(√3 + i√15)(√3 - i√15)
= 3 - 15i^2
= 3 - 15(-1) = 18

2. I am pretty sure you meant:
(8+16i)(2i)

= (8 + 16i)/(2i) * i/i
= (8i + 16i^2)/(2i^2)
= (8i - 16)/-2
= 8 - 4i