Respuesta :

Answer:

-9x^9y^5

Step-by-step explanation:

Do the multiply first:

-16x^9y^5+7x^9y^5

=x^9y^5(-16+7)

=-9x^9y^5

Answer:

-9x^9y^5

Step-by-step explanation:

this could be wrong since there was a lot of terms but oh well