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Math Help - finding a and b in quadratic function

  1. #1
    xwy
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    finding a and b in quadratic function

    Hello everyone, I do not how to initiate the first step for this question. However, I know it has to do with the vertex and the axis of symmetry. The attached image is the question. Pls help me out!finding a and b in quadratic function-imag0139_1.jpg
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    Re: finding a and b in quadratic function

    The axis of symmetry is x = -b/(2a).
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    Re: finding a and b in quadratic function

    Alternatively, if the axis of symmetry is x= -3/8 the quadratic is of the form y= a(x+ 3/8)^2+ e. The fact that "c" is equal to 7 will allow you to find one of a and e as a function of the other but you cannot determine both.
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    Re: finding a and b in quadratic function

    Quote Originally Posted by HallsofIvy View Post
    Alternatively, if the axis of symmetry is x= -3/8 the quadratic is of the form y= a(x+ 3/8)^2+ e. The fact that "c" is equal to 7 will allow you to find one of a and e as a function of the other but you cannot determine both.
    The question asks for A possible function, not THE possible function.
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