## Algebra and Trigonometry 10th Edition

13 a)$1/(1+i) = 1/(1+i) * (1-i)/(1-i) = (1-i)/2$ b)$1/(3-i) = 1/(3-i) * (3+i)/(3+i) = (3+i)/(9+1) = (3+i)/10$ c)$1/(-2+8i) = 1/(-2+8i) * (-2-8i)/(-2-8i) = (-2-8i)/68 = (-1-4i)/34$