When asked to factor the trinomial, a student gives the answer (3x - 2) (3x - 2). What is one thing wrong with this answer?

one thing wrong is there is not closing parenthasees after x+1

and also, if you multiply it out, the answer is not 8x^2-8x-16 so the factored form given is worng

the real factored out form is 8 (x-2) (x+1)

that person forgot the 8 in the front

The wrong thing with this answer is that a trinomial only has 3 terms, hence the "tri" in trinomial.