Answer
$ \frac{18+20x^{2}}{15x^{8}}$
Work Step by Step
Given : $\frac{6}{5x^{8}} + \frac{4}{3x^{6}}$
$= \frac{6\times 3}{5x^{8} \times 3} + \frac{4\times 5x^{2}}{3x^{6}\times 5x^{2}}= \frac{18}{15x^{8}} + \frac{20x^{2}}{15x^{8}}$
(Finding the least common denominator)
$= \frac{18+20x^{2}}{15x^{8}}$
