(a).

Find the value of the expression  and  using graphing utility.

Graph :

(1) Draw the coordinate plane.

(2) Graph the functions .

Observe the garph :

The values of  and  are :

.

.

(b).

The function  is defined for all values in the interval .

Let .

The function  is defined for all values in the interval .

.

The function  is defined for all values in the interval .

(a).

.

.

(b). The function  is defined for all values in the interval .