$\"\"$

The function is $\"\"$

Find $\"\"$ .

Graph the function $\"\"$ :

$\"\"$ .

Observe the graph:

The region from $\"\"$ to $\"\"$ is in the shape of rectangle.

The region from $\"\"$ to $\"\"$ is in the form of trapezoid.

The area of rectangle is $\"\"$ .

The area of trapezoid is $\"\"$ .

$\"\"$

$\"\"$ area of rectangle + area of trapezoid.

$\"\"$

$\"\"$ . $\"\"$

$\"\"$ .