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  • Perplex
    IB Math AIHL
    /
    Modelling
    /

    Quadratic Models

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    Key Skills

    Quadratic Models

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    Practice exam-style quadratic models problems

    Key Skills

    Quadratic Models
    SL AI 2.5

    A quadratic model has a turning point (vertex) at which its minimum or maximum value occurs. The general form of a quadratic equation is ​ax2+bx+c.


    If ​a<0, the turning point of a quadratic is its maximum; if ​a>0, the turning point of a quadratic is its minimum.

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    Quadratic x-intercepts
    SL AI 2.5

    The roots of a quadratic correspond to the ​x​-intercepts of its graph. When ​x=a​ or ​x=β, the entire expression equals zero, which is reflected on the graph.


    The equation of the parabola below is ​−(x−α)(x−β):


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    Vertex and Axis of Symmetry
    SL AI 2.5

    The graph of a quadratic function has the general shape of a parabola.


    It is symmetrical about the axis of symmetry and has a maxima or minima at the vertex, which lies on the axis of symmetry.

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