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Pre calculus

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find the domain of the given function
f(x)=square root 9-x

  • Pre calculus -

    You know that sqrt(u) has domain u>=0. In this case, u = 9-x. So, yu must have

    9-x >= 0
    9 >= x
    or, as usually written
    x <= 9
    or
    {x:x<=9}
    or
    x in (-oo,9]
    depending on desired notation.

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