Respuesta :

wegnerkolmp2741o

Answer:

a^3-2a^2-a

Step-by-step explanation:

(6a^3+7a^2)-(5a^3+9a^2+a)=

Distribute the minus sign

(6a^3+7a^2)-5a^3-9a^2-a=

Combine like terms

6a^3-5a^3+7a^2-9a^2-a=

a^3-2a^2-a