Respuesta :

(7n)(n−1)+n2
=(7n)(n)+(7n)(−1)+n2
=−7n2
+7n
+n2

=7n2+7n+n2

=(7n2+n2)+(7n)

=6n2+7n

Hope this helps!
-6n^2 + a + 7n
hopefully this helps