f(x)=x3−x is not one-one function as f(A)=f(0)=f(−1)=0f(x)=x3−x is a polynomial function and every polynomial fanction is continnous and differentiable in its domala. If x⟶∞, then f(x)⟶∞[∵f(x) is a cubic function ] If x⟶−∞, then f(x)⟶−∞ So, ⟶ ∞ f(x) ∈ R andx∈R ∴ f(x) is onto function.