Question

f(x)=2x³ +5 on R .

Answer 1

We can observe that f(x) increases when the values of x are increased and f(x) decreases when the values of x are decreased. Also, f(x) can be reduced by giving small values of x.

Similarly, f(x) can be enlarged by giving large values of x.

So, f(x) does not have a minimum or maximum value.