Thanks, much appreciate the help guys. I will work on the above solutions and get back to you.

Keep up the good work

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Edit

Mr Fan.

You said that 0 is not a positive real number real but it is a real number right?

Mr F says: Yes. Just not positive?

Mr F says: Correct.
Also what do you mean by "However, you can consider the limit of the function as x --> 0"

Mr F says: x = 0 is not in the domain but x can approach 0 as a limit. Don't worry about this as it will probably be more confusing than helpful. When drawing the graph, just calculate f(0) and then put an open circle at the point to indicate that it's not included.
Lastly you said that one should draw the graphs of the functions to find their ranges, but we can't do that for each function as it would take too much time and would not be accurate. Please correct me if I am wrong.

Mr F says: It shouldn't take very long to draw a parabola that is written in turning point form. You only want to use the graph to get the range, so you don't have to worry about things like x-intercepts. ONly show that informtaion that is relevant to finding the range. As I said, you should be able to do this in short order (if not, you need to start practicing).
Thanks again.