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Math Help - [SOLVED] SAT math 683 #14

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    [SOLVED] SAT math 683 #14

    Again, I am cramming the SAT math. Any helpful replies for my threads are greatly thanked and appreciated! Thanks

    If the function f is defined by f(x)=x^2=bx+c, where b and c are positive constants, which of the following could be the graph of f?

    I already eliminated a) and b) since i can tell from the function that a is positive so it has to be concave up. (a and b where both graphs which where concave down) (:

    Thanks in advance

    (Sorry for the sloppy graphs)
    Attached Thumbnails Attached Thumbnails [SOLVED] SAT math 683 #14-c-.jpg   [SOLVED] SAT math 683 #14-d-.jpg   [SOLVED] SAT math 683 #14-e-.jpg  
    Last edited by fabxx; September 28th 2008 at 06:56 AM. Reason: sloppy graphs
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    Quote Originally Posted by fabxx View Post
    Again, I am cramming the SAT math. Any helpful replies for my threads are greatly thanked and appreciated! Thanks

    If the function f is defined by f(x)=x^2=bx+c, where b and c are positive constants, which of the following could be the graph of f?

    I already eliminated a) and b) since i can tell from the function that a is positive so it has to be concave up. (a and b where both graphs which where concave down) (:

    Thanks in advance

    (Sorry for the sloppy graphs)
    The graphs are okay

    Think of the y intercept (that is to say when x=0)
    f(0)=c, which is positive.
    So you can eliminate one of the graphs.

    After that, I don't know if you consider 0 as being positive, or if you can choose 2 graphs
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    Thanks Moo!! You are veryyyyyyyyy helpful! (:
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