Respuesta :

Setor9
A)7a^4b^4(-3a^2b^3)
= -21a^6b^7

B)(8m-9)(4m+4). __Distribute
8m(4m+4)-9(4m+4)
32m^2+32m-36m-36..__Combine like terms

=32m^2-4m-36
First one :

7a4b4((−3a2)(b3))

=−21a^6b^7

Second one :

(8m−9)(4m+4)

=(8m+−9)(4m+4)

=(8m)(4m)+(8m)(4)+(−9)(4m)+(−9)(4)

=32m2+32m−36m−36

=32m^2−4m−36

Hoped I helped!