If a factor of 2x "2 + X" 2-12x + m is 2x + 1, then the value of M is?

If a factor of 2x "2 + X" 2-12x + m is 2x + 1, then the value of M is?


Let (2x + 1) (x + a) = 2x "2 + X" 2-12x + M
Expand the corresponding equal, it can be, the teacher did not say oh!