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How to find domain and range on graphing calculator?
May 8, 2008
How (if possible) can you find the domain and range of a graph on a graphing calculator (which in my case is a TI-84 Plus)?
(3 answers total)
Strictly speaking, the domain and range of the graph are defined by you using the "window" function. If you want the domain and range of the function, I think you'll have to do it the old fashioned way (by hand) or by using something that can manipulate symbols for you (e.g. a TI-89).
What, precisely, are you trying to do here?
on May 8, 2008
The domain is whatever you define it to be; that is, you could say
an integer only: you need to specify the domain when giving a function. Typically (at least in introductory math courses) it is assumed that the domain of a function
) is all real numbers
) is a real number. Typically given that assumption, you need to find out the domain yourself: if there's a radical of even power and you're not involving complex numbers, you need to solve for when the radicand is negative; if there's a rational function, you need to solve for when the denominator is zero; if there's a tangent, cotangent, secant, or cosecant function, you need to solve for its undefined values; if there's a logarithmic function, you need to solve for when its argument is negative.
Finding the range (given a domain, of course) is not necessarily a straightforward process. Your best bet will be to look at the graph, as Commander Rachek suggested.
on May 8, 2008
You don't need a calculator to find the domain/range of a function, nor should you be using one to try to find these things.
Follow the advice of likedoomsday above.
on May 9, 2008
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