Question

@sidsiddhartha

Answer 1

used l'hospitals?

Answer 2

\[its ~x^3.e^{-x/5}~or~(x^3.e^{-x})/5\]

Answer 3

look as a decreasing exponential is multiplied with a polynomial so limit should approach to 0

Answer 4

but u can try it using l'hospitals rule :)

Answer 5

:)