Which description best explains the domain of (g * f ) (x)

(g*f)(x) is the product of functions g(x) and f(x).   if either g(x) or f(x) has a restricted domain, then the domain of (g*f)(x) is restricted similarly.in this problem, you are asked to explain what the concept of domain is in the context of multiplying two functions together.   in general, "domain" signifies the set of acceptable input, or x, values. elaborate:   what do you really need to learn or do here?  

These graph is cross the yaxis and x axis two ways.