28n^4 +16n^3 -80n^2
we can factor out a 4n^2
4n^2 (7n^2 +4n - 20)
4n^2 (7n-10) (n+2)
Answer:
use formula
(x,y) =[ (x1+x2)/2 ,(y1+y2/2)]
=[(-2-8)/2, (3-9)/2]
=(-10/2 ,-6/2)
=(-5,-3)
thank you for the free point have a great rest of your day