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domain and range watch

    • Thread Starter

    im really confused about certain ways to get the domain of a function. how do you tell when it is a one tail or two tail domain? and when do you use the inequalities < and > or <_ and >_?

    also how do you find the range? thanks!

    just think of it like this

    > has a bigger side on the left, so what ever's on the left is bigger than the right

    and the lines means, it's equal to aswell as bigger/smaller

    i think someone who knows the meaning of the word function understands that :P i think the OP is after definitions/ techniques for finding range and domains etc

    Well say the equation is f(x) =  \sqrt{x(x-6)}, f(x) \epsilon \Re. For which values of x does the function have meaning? Well, when x(x-6) >= 0 since we can't square root a negative number. So solving the inequality we get x <= 0 , x >= 6.
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Updated: January 10, 2008

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