81p^2 -4m^2-n^2+4mn Share with your friends Share 0 Manbar Singh answered this 81p2 - 4m2 - n2 + 4mn=81p2 - 4m2 + n2 - 4mn=9p2 - 2m2 + n2 - 22mn=9p2 - 2m-n2=9p + 2m-n9p - 2m-n=9p+2m-n9p-2m+n 4 View Full Answer
