Factorize:

15x2 – x – 28

We have,



Now by using middle-term splitting, we get


= 15x2 + 20x - 21x - 28


= 5x (3x + 4) - 7 (3x + 4)


= (3x + 4) (5x - 7)


Hence,


The given expression can be factorized as:



31