1.f(x-1)=x^2+2x-1=(x+1)^2-2=(x-1+2)^2-2f(x)=(x+2)^2-22.f(x+2)=x^2+2x-1=(x+1)^2-2=(x+2-1)^2-2f(x-1)=(x-1-1)^2-2==(x-2)^2-2
