Ответ:
Объяснение:
x²+4xy+3y²-6y-9=
=x²+4xy+4y²-y²-6y-9=
=(x+2y)²- (y+3)²=
=(x+2y+y+3)(x+2y-y-3)=
=(x+3y+3)(x+y-3)
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Ответ:
Объяснение:
x²+4xy+3y²-6y-9=
=x²+4xy+4y²-y²-6y-9=
=(x+2y)²- (y+3)²=
=(x+2y+y+3)(x+2y-y-3)=
=(x+3y+3)(x+y-3)