упростите выроожение (2ab^2+3)*(3-2ab^2)+4a^2b^4

=-(3-2ab^2)*(3-2ab^2)+4a^2b^4=-(3-2ab^2)²+4a^2b^4=-(9-4аb^2+4a^2b^4)+4a^2b^4=-9+4аb^2-4a^2b^4+4a^2b^4=-9+4аb^2