(y-k)^2= 4p(x-h)
head الرأس (h,k)
البؤرة (h+p,k)
الدليل =h-p
موازي لـ X

when the head equal zero(0,0)
we'll write it like that
(y-0)^2=4p(x-0)
that mean
y^2=4px

tell me it's ok now?