f(x) = - x2 + 2x; {–1, 2, 3}
Ar = {-3, 0, -3}
Br = {1, 8, 3}
Cr = {2, 8, -3}
Dr = {-3, 0, 3}
Ar = {-3, 0, -3}
Br = {1, 8, 3}
Cr = {2, 8, -3}
Dr = {-3, 0, 3}