Question

An open box is to be made from a flat piece of material 19 inches long and 5 inches wide by cutting equal squares of length x from the corners and folding up the sides.

Write the volume V of the box as a function of x. Leave it as a product of factors, do not multiply out the factors.
V(x)=


If we write the domain of V(x) as an open interval in the form (a,b), then what is a?
a=

and what is b?
b=