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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

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