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Hong Kong junior high school mathematics topic! Factorization, cross multiplication! Urgent! ! !
3x? -4x? y-7xy?

=x(3x? -4xy-7y? )

=x(3x-7y)(x+y) (cross multiplication)

3X ﹣7Y

× (schematic diagram of cross multiplication)

X Y

3x*x=3x? ﹣7y*y=﹣7y?

﹣7xy+3xy=﹣4xy

You can ask if you don't understand! Satisfied, please adopt it in time! O(∩_∩)O