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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it's a slightly modified vertex form vertex form would be $y = \dfrac{1}{4a}(x-h)^2+k$
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 $y = k - p$