$\"\"$

The function is $\"\"$ .

To find the absolute extreme of function in given region $\"\"$ , sketch the function.

$\"\"$

Observe the graph :

Left end point $\"\"$ is minimum point over the interval $\"\"$ .

Right end point $\"\"$ is maximum point over the interval $\"\"$ .

$\"\"$

Minimum point is $\"\"$ .

Maximum point is $\"\"$ .