Domain can't include 2 or-2
Well, it would be far better to write "domain (-infinity, 1/3) U (1/3, infinity)". Do you see why?
One way to handle a "range" problem is to convert it into a "domain" problem by looking at the inverse function. The domain of is the range of f and vice-versa.and range (-infinity, 0) U (0, inifinity). correct?
If we write them so and . Now what value can y not be?
Much the same. We cannot have -2+ |w|= 0 so we cannot have |w|= 2. What values of w are forbidden?2: f(w) = 7 / ( -2 + |w| )
(This is the one biffboy was referring to.)
As for the range, again, let y= 7/(-2+ |w|) so that |w|- 2= 7/y so |w|= 2+ 7/y. What can y not be?
i have no idea about number two. help please~![/QUOTE]