The length of a rectangle is 4 units greater than its width and the area of the rectangle and the area of the rectangle can be expressed by the equation y= x^2 + 4x. what is a reasonable domain for this function

The domain of a function is the set of input or argument values for in which the function is real and defined. This is the definition of Domain. The function,y=x2+4x, has no undefined points or domain constraints. Therefore, the domain is - ∞ < x < ∞.   (∞=infinity symbol)

The domain of a function is the set of input or argument values for in which the function is real and defined. This is the definition of Domain. The function,y=x2+4x, has no undefined poin or domain consaints. Therefore, the domain is infintity i think