2.8.64 Power Series

Condition: Lay the functions into the steppe rows according to degrees \ (x \) using standard decays. Indicate the intervals of their convergence. a) \ (f (x) = \ ln \ left (\ frac {x^{3} +2} {2} \ right) \), b) \ (f (x) = \ frac {3 x} {8 x^{2} -1} \)