-(3m²-n)(3m²+n)

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-(3m²-n)(3m²+n)-(3m²-n)(3m²+n)-(3m²-n)(3m²+n)-(3m²-n)(3m²+n)

-(3m²-n)(3m²+n)
-(3m²-n)(3m²+n)

-(3m²-n)(3m²+n)
-(3m²-n)(3m²+n)
=-(9m^4-n²)
=n²-9m^4