Question 399871
If Vertex (0;0),Focus (p;0) then the equation in  standard form for parabola is {{{y^2=4*p*x}}}(directrix is line x=-p)
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Focus (-8;0) p=-8
{{{y^2=4*(-8)*x}}}
{{{y^2=-32x}}}
if you ask about directrix: if Focus (-8;0) directrix is line x=8
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If Vertex (0;0),Focus (0;p) then the equation in  standard form for parabola is {{{x^2=4*p*y}}}(directrix is line y=-p)