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Math Help - Function help

  1. #1
    Newbie
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    Function help

    On a particular problem,

    5. Given the function: y= (x + 1)^2 - 8

    i) Identify each function is a linear, quadratic, sqrt, or reciprocal function. I got quadratic.

    ii) State the domain and range. D = { x E R } R = { y E R | y ≥ -8}

    iii) Determine f(3). Solved and got f(3) = 8

    However on the last part.. I think it might be to vague or I may be dumb.. it states.

    iv) Express the function in two other ways..

    Umm, does that mean in graph form, ordered pairs, table of values? Im not quite sure I follow any help would be appreciated. Thanks in advance.
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  2. #2
    Super Member Quacky's Avatar
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    Windsor, South-East England
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    Quote Originally Posted by danzig View Post
    I think it might be to vague or I may be dumb.. it states.

    iv) Express the function in two other ways..

    Umm, does that mean in graph form, ordered pairs, table of values? Im not quite sure I follow any help would be appreciated. Thanks in advance.
    It is incredibly vague. The function initially appears to be in "vertex form", so try expressing it in the form y=ax^2+bx+c. Then check to see whether it factorizes. I wish I could assist you, but that is poorly worded. If it doesn't, perhaps you could sketch the function; that is, a plan of the graph's general shape, including labels of the function's intercepts with the co-ordinate axes, and its minimum value.
    Last edited by Quacky; March 3rd 2011 at 02:31 PM.
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