(4x-9)(5x)
(3x^2 - 5x +2 ) (3x-6)
(x- 4) (x + 5)
( 4 x ) ( - 8 x )
(7ab - 4) (-3ab +3)
(- 4x) ( -5x - 4)
(6x)(-3x)
( a - 3b + 4c ) ( 2a )
20x^2-45x
-21a^2b^2 + 33 a b -12
- 32 x^2
20x^2 +16 x
-18x^2
x^2 + 1x-20
2 a^2 - 6 ab + 8 ac
9x^3 - 33x^2 +36x -12