name for the form of an equation

Jul 2010
614
5
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.
 

romsek

MHF Helper
Nov 2013
6,727
3,030
California
it's a slightly modified vertex form

vertex form would be

$y = \dfrac{1}{4a}(x-h)^2+k$
 
Dec 2014
153
117
USA
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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