$\"\"$

The functions are $\"\"$ and $\"\"$ .

(a)

Graph the functions $\"\"$ and $\"\"$ .

Graph:

$\"\"$

As the domain of the function $\"\"$ is entire of $\"\"$ .

Thus, the function is continuous on $\"\"$ , so graph of $\"\"$ is not the line

$\"\"$ .

$\"\"$

(b)

Consider $\"\"$ .

Observe the graph :

Extrema of the function $\"\"$ is $\"\"$ .

$\"\"$

(a)

$\"\"$

$\"\"$ is not the line $\"\"$ .

(b) Extrema of the function $\"\"$ is $\"\"$ .