Respuesta :

Americ
=(y2-3y-5)-(-y2-7y+4)
=y2-3y-5+y2+7y-4
=2y2+4y-9

Hope this helps! :)

Answer:

=(y2-3y-5)-(-y2-7y+4)

=y2-3y-5+y2+7y-4

=2y2+4y-9