3x2 + 16x + 5
since 3 and 5 are not perfect squares, the polynomial is not a perfect square.
But, since 16 = 3*5+1, we should try
(3x+1)(x+5)
yep, that works.
So the factored form of the polynomial is:
(3x+1)(x+5)
gee - great contribution, there, Bot.
Chime in after I do all the work...