Pre-Cal

Find the domain of the function.

sqrt of x^2-9

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  1. The domain of a function is the set of all possible input values, which allows the function formula to work.

    In this case when x ^2 > 9 then x ^ 2 -9 < 0

    Square root negative numbers are complex numbers.

    So domain of your function :

    x ¡ 2 > 9

    x > + OR - 3

    thats mean

    x <= - 3 and x >= 3

    Becouse numbers less of - 3:

    -4,-5,-6...

    numers larger of 3:

    4,5,6...

    DOMAIN:

    x <= - 3 and x >= 3

    OR

    (-infinity,-3) U (3,infinity)

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