X^2+7xy-18y^2 how do i solve this i'm factoring trinomials

Changes made to your input should not affect the solution:

 (1): "y2"   was replaced by   "y^2".  1 more similar replacement(s).

 2.1    Factoring    x2 - 7xy - 18y2 

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

 Found a factorization  :  (x + 2y)•(x - 9y)

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