(i) Given:
Since for all R
Adding 3 both sides,
Therefore, the minimum value of is 3 when , i.e.,
This function does not have a maximum value.
(ii) Given:
=
……….(i)
Since for all R
Subtracting 2 from both sides,
Therefore, minimum value of is and is obtained when , i.e.,
And this function does not have a maximum value.