Find the product of algebraic expression |

18 : ( x^2 - y^2) ( x + 2y )
19 : ( 2x + 3y - 5 ) (x + y )
20 : (3x + 2y - 4 ) ( x - y )
21 : ( x^2 - 3x + 7 ) ( 2x + 3 )
22 : ( 3x^2 + 5x - 9 ) ( 3x - 9 )
23 : ( 9x^2 - x + 15 ) ( x^2 - 3)
24 : ( x^2 + xy + y^2 ) ( x - y )
25 : ( x^2 - xy + y^2 ) ( x + y )
26 : ( x^2 - 5x + 8 ) ( x^2 + 2)
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