Plz explain me this in detail

Since 2 V, COnverges, Example: Test for the convergence of the series whose nh term is {(n+ 1)3 n}. /3 Solution. Let u = (n3+ 1)3 n = n or 9nt 1 1 + or U3n 9n 1 Let V n2, So that 2 V, converges n