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Math Help - Domain + Intervals

  1. #1
    Junior Member
    Joined
    Sep 2008
    Posts
    41

    Domain + Intervals

    The domain of the function f(x) = square root -x^2+9x-8 cosists of one or more of the following intervals : (-infinity, A], [A,B] and [B, infinity) where A< B
    Find A:_______
    Find B:_______
    For each internval, anwser YES or NO to where the interval is included in the solution.
    (- infinity, A] :____
    [A,B] :_____
    [B, infinity): _____
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  2. #2
    Member
    Joined
    May 2009
    Posts
    211
    Try analysing the polynomial inside the root:
    > or = 0
    and see what intervals you come up with.
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