Answer
Answers may vary, and two possible solutions are provided.
34: $6n^2+34n+28 =(6n+28)(n+1)$
59: $6n^2+59n+28 = (3n+28)(2n+1)$
Work Step by Step
$6n^2+xn+28$
$(6n+28)(n+1) = 6n^2+6n+28n+28 = 6n^2+34n+28$
$(3n+28)(2n+1) =6n^2+3n+56n+28 = 6n^2+59n+28$