f(x)=(x+1)^6-2 x y -2.5 9.390625 -2.2 0.985984 -1.9 -1.468559 -1.6 -1.953344 -1.3 -1.999271 -1 -2 -0.7 -1.999271 -0.4 -1.953344 -0.1 -1.468559 0.2 0.985984 0.5 9.390625