ANSWER :
D.
EXPLANATION :
From the problem, we have the upper and lower tiles.
Upper tiles :
-x^2 + 2x + 3
Lower tiles :
-x^2 - 2x - 1
We can notice that 1 was canceled together with -1
So we can say that the operation is addition since 1 + (-1) = 0
So the expression will be :
[tex](-x^2+2x+3)+(-x^2-2x-1)=-2x^2+2[/tex]
