Question 722870
Just looking at the polynomial, a person would usually not know, but these arrangements should be examined:

(4x______)(x_______),
and 
(2x_____)(2x________).  


Look for a pairs of numbers which give product of 12, but when the resulting "I" and "O" products are summed, give 19x.  I am specifically referring to the F.O.I.L. multiplication process for two binomials.


F.O.I.L. stands for "first, outer, inner, last."
As an example, (a+b)(c+d), first is ac, outer is ad, inner is bc, last is bd.