Question

(9x²-25)*($frac{1}{3x-5}$-$frac{1}{3x+5}$

Answer 1

$((3x)^2-5^2)*( frac{1}{3x-5} - frac{1}{3x+5} )=((3x)^2-5^2)*frac{(3x+5)-(3x-5)}{(3x)^{2}-25}=$

$=frac{((3x)^2-25)*10}{(3x)^{2}-25}=10$