## anonymous 5 years ago the expression 10/(3 + i) is equivalent to: 1) 3 - i 2) (15 + 5i)/4 3) 3 + i 4) 5/4

1. anonymous

$\frac{10}{3+i}=10\frac{1}{3+i}=10\frac{1}{3+i} \times \frac{3-i}{3-i}=10\frac{3-i}{3^2-i^2}=10\frac{3-i}{10}$

2. anonymous

$=3-i$

3. anonymous