# Math Help - a + bi form?

1. ## a + bi form?

how would you do that for "i" and "1-3i"

it says to find the recepricol of each and put it in a + bi form

2. $\frac{1}{i}=\frac{-i}{-i^2}=-i$

$\frac{1}{1-3i}=\frac{1+3i}{(1-3i)(1+3i)}=\frac{1+3i}{10}=\frac{1}{10}+\frac{3}{1 0}i$