Smile 發問於 科學及數學數學 · 1 年前

Maths : how to do, thanks?

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  • 1 年前
    最愛解答

    "The vertex of the graph y=f(x) is V(3,y)" implies a few things:

    1. f(x) is quadratic, k not zero; 2. f(x)=k(x-3)^2+b, when completed perfect square; 3. f'(3)=0. Either 2. or 3. leads to k=2 and so y=f(3)=-16.

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