Answer:
(3m - 2) x (3m - 2) x (m + 4)
Step-by-step explanation:
Both "chunks" can be divided by (m+4)
9m^2(m+4) - 4(m+4)
You can move the -4 coefficient to the 9m^2 because then you can merge the (m+4)s into one (m+4) because if you did it backwards, (m+4) would be multiplied by each term in the new first "chunk"
(9m^2 - 4) x (m+4)
(9m^2 - 4) is a difference of squares, so it can be broken into the square root of the first term minus the square root of the second term
(3m - 2)^2 x (m+4)
Squaring something is multiplying it by itself, so (3m - 2)^2 = (3m - 2) x (3m - 2)
(3m - 2) x (3m - 2) x (m + 4)
