-(2x²+3y)(3y-2x²)=

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-(2x²+3y)(3y-2x²)=

-(2x²+3y)(3y-2x²)=
-(2x²+3y)(3y-2x²)=

-(2x²+3y)(3y-2x²)=
(2x²)²-(3y)²
=4x四次方-9y²