Answer:
A symmetric property
Step-by-step explanation:
-1
R={-1, -11, 7}
-2(2)^2+7=
-2(4)+7=
-8+7=
-2(-3)^2+7=
-2(9)+7=
-18+7=
-11
-2(0)^2+7=
-2(0)+7=
0+7=
7
i think it's a