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Math Help - domain & range of functions

  1. #1
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    domain & range of functions

    I need some help understanding the domain & range of functions

    E.g. h(x) = X^2 +2

    g(x) = sq.root x-1

    Thanks
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  2. #2
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    Quote Originally Posted by terminator View Post
    I need some help understanding the domain & range of functions

    E.g. h(x) = X^2 +2

    g(x) = sq.root x-1

    Thanks
    The domain of a function is the set of valid x-values a function can take so in your example, h(x)=x^2+2 ,it can take all real values of x. As for g(x)=sqrt(x)-1, there is restriction on the values of x it can take. We know that the values under a square roots is always greater or equals 0. Hence, the domain is all x, for x>=0. Range is then the 'output' of the function. Sketch the graph and take note of the minimum and maximum value of the graph.
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