Question

Factorize 12 x^2y -17xy- 40
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Answer 1

Answer:

(((22•3x2) • y2) - 17xy) - 40

STEP2:Trying to factor a multi variable polynomial

 2.1    Factoring    12x2y2 - 17xy - 40 

Try to factor this multi-variable trinomial using trial and error 

 Found a factorization  :  (3xy - 8)•(4xy + 5)

Final result :

(3xy - 8) • (4xy + 5)