Problema Solution
The length of a rectangle is 4 units greater than its width, and the area of the rectangle can be expressed by the equation y = x2 + 4x. What is a reasonable domain for this function?
Answer provided by our tutors
We need to find the domain of y = x^2 + 4x.
The length has to be positive thus x>0
Also for x>0 we have y>0 thus the domain is (0, ~).