Posted by mikey on .
Simplify and write in standard form.
1.)
(radical 3 + i radical 15)(radical 3  i radical 15)
2.)
8 + 16i / 2i
Thanks again everyone. Any help is appreciated.

trigonometry 
Reiny,
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