$\"\"$

The function is $\"\"$ .

The boundaries from $\"\"$ to $\"\"$ .

The area can be mathematically written as $\"\"$ .

$\"\"$

Multiply each side by $\"\"$ .

$\"\"$

The obtained expression is in the form of $\"\"$ .

Where $\"\"$ .

Subustiute values in the quadratic formula $\"\"$ .

$\"\"$

Since negative values are not considered, $\"\"$ is a solution.

$\"\"$ .

$\"\"$

The value of $\"\"$ is $\"\"$ .