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Math Help - Pre-Cal Test Review Questions

  1. #1
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    Pre-Cal Test Review Questions



    I need help with questions 1 and 3.

    For question 1, I've gotten as far as what is shown but I don't know where to go from there. As for question 3 I am completely clueless.
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  2. #2
    Super Member TheChaz's Avatar
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    Re: Pre-Cal Test Review Questions

    3 is interesting...
    Most common definitions of "continuous" (esp with respect to the real numbers) at a point require that the point BE IN THE DOMAIN.

    So we have (-4, 4), as an open interval, outside of the domain. Some would distinguish this as "not continuous" versus "discontinuos".
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  3. #3
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    Re: Pre-Cal Test Review Questions

    What my pre-cal teacher meant by that was where the function stops, and I figured out that the y-intercept is the root of 16 (4) and that it stretches from -4 to 4, so I expressed the discontinuous parts to be from XE(-infinity,-4)V(4,infinity)

    Now the second part of that question makes no sense to me. X/X-3 would cause the X to cancel out, leaving you with 0/3 and the graph would be blank. I typed it into my graphing calculator and that's all I came up with.
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  4. #4
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    Re: Pre-Cal Test Review Questions

    Quote Originally Posted by Jordan1608 View Post
    What my pre-cal teacher meant by that was where the function stops, and I figured out that the y-intercept is the root of 16 (4) and that it stretches from -4 to 4, so I expressed the discontinuous parts to be from XE(-infinity,-4)V(4,infinity)

    Now the second part of that question makes no sense to me. X/X-3 would cause the X to cancel out, leaving you with 0/3 and the graph would be blank. I typed it into my graphing calculator and that's all I came up with.
    But, you don't have x/x-3, you have x/(x-3) . x does not cancel out for x/(x-3) .
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