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    murcorm's Avatar
    murcorm Posts: 5, Reputation: 1
    New Member
    		  
    #1

    Apr 29, 2008, 10:55 AM
    Maximum or Minimum
    For the function y = 3x^2 + 12x + 9 find:

    A. Whether the curve is concave up or down

    B. The y-intercept

    C. The x-intercept

    D. The Vertex

    E. The Maximum or Minimum value.
    you_know's Avatar
    you_know Posts: 38, Reputation: 1
    Junior Member
    		  
    #2

    Apr 29, 2008, 10:58 AM
    You can put this in a calculator. I am not good with math but I am sure you can put it in a calculator. Consider tutoring.
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #3

    Apr 29, 2008, 11:32 AM
    Look at the term in front of the x^2. If it is positive it is concave up. If it is negative, it is concave down.

    To find the y intercept, set x=0 and solve.

    To find the x-intercept, set y=0 and solve.

    To find the vertex, use

    That is the x coordinate of the vertex. PLug that number back into your function to find the y-coordinate.

    The vertex will be your minimum value.
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