Respuesta :

Step-by-step explanation:

(b2 + 8 )(b2 - 8)

(b2 + 8 )(b2 - 8)=b4 - 8b2 + 8b2 - 64

(b2 + 8 )(b2 - 8)=b4 - 8b2 + 8b2 - 64=b4 - 64