Factorize:

5x2 – 16x – 21

We have,



Now by using middle-term splitting, we get


= 5x2 + 5x - 21x - 21


= 5x (x + 1) - 21 (x + 1)


= (x + 1) (5x - 21)


Hence,


The given expression can be factorized as:



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