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f(x)=rad. x-9

write the intervals of the functions. How do I put the set of numbers in the form of intervals such as infinity.

I solved it and got the answer as this:
x < or = 9
Please help me, I am stuck.

  • math -


    means the interval's lower limit is at but excludes ∞. The exclusion is signified by the left parenthesis "(".
    The upper limit is 9, and 9 is included, as indicated by the square bracker "]".

    I do not quite understand the meaning of
    f(x)=rad. x-9
    so I cannot comment on whether the answer is correct.

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