Chapter 8 Rational Functions - 8.5 Add and Subtract Rational Expressions - 8.5 Exercises - Problem Solving - Page 587: 41

$\approx10.2$

$T=\frac{d}{a-j}+\frac{d}{a+j}=\frac{d(a+j)}{(a-j)(a+j)}+\frac{d(a-j)}{(a-j)(a+j)}=\frac{da+dj+da-dj}{(a-j)(a+j)}=\frac{2da}{a^2-j^2}$ Plugging in the given values we get: $T=\frac{2(2468)(510)}{(510)^2-(115)^2}\approx10.2$