(-2ab²)²*(3a²b-2ab-1)= Calculation questions

(-2ab²)²*(3a²b-2ab-1)= Calculation questions

(-2ab²)²*(3a²b-2ab-1)
=4a²b^4×(3a²b-2ab-1)
=12a^4b^5-8a³b^5-4a²b^4