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Thread: name for the form of an equation

  1. #1
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    name for the form of an equation

    Hi;
    I know standard form, vertex form and intercept form of quadratics.

    but I don't know what this form is called (x - h)^2 = 4a(y - k)

    Thanks.
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  2. #2
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    Re: name for the form of an equation

    it's a slightly modified vertex form

    vertex form would be

    $y = \dfrac{1}{4a}(x-h)^2+k$
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  3. #3
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    Re: name for the form of an equation

    The form $(x - h)^2 = 4p(y - k)$, is a “standard” form written with information to locate the parabola’s focus and directrix ... the focus is $(h, k + p)$ and the directrix is $y = k - p$
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