$\"\"$

The volume of the rectangle box is $\"\"$ m $\"\"$ .

Consider $\"\"$ be the length of the square base and $\"\"$ be the height of the rectangle.

Then the volume of the rectangle with square base is $\"\"$ .

Find height in terms of length of the base $\"\"$ .

$\"\"$

The surface area of the open rectangle box is $\"\"$ .

Substitute $\"\"$ in the surface area.

$\"\"$

The surface area of the box in terms of length of the base is $\"\"$ .

Domain :

The function is $\"\"$ does not have any radical.

The denominator of the function should not be a zero.

Surface area should be a positive, it can not be a either zero or negative.

So all positive real numbers of $\"\"$ is the domain of the function $\"\"$ .

The domain of the function $\"\"$ is $\"\"$ .

$\"\"$

The surface area of the box in terms of length of the base is $\"\"$ .

The domain of the function $\"\"$ is $\"\"$ .