Question 876042
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Hi
Need to Know...............................................................
Standard Form of an Equation of a Circle is {{{(x-h)^2 + (y-k)^2 = r^2}}} 
Standard Form of an Equation of an Ellipse is {{{(x-h)^2/a^2 + (y-k)^2/b^2 = 1 }}} 
Standard Form of an Equation of an Hyperbola opening up and down is:{{{(y-k)^2/b^2 - (x-h)^2/a^2 = 1}}} 
Standard Form of an Equation of an Hyperbola opening right and  left is:{{{(x-h)^2/a^2 - (y-k)^2/b^2 = 1}}} 
the vertex form of a Parabola opening up(a>0) or down(a<0), {{{y=a(x-h)^2 +k}}}
 the vertex form of a Parabola opening right(a>0) or left(a<0), {{{x=a(y-k)^2 +h}}}
focus at (-1, 0) and its directrix at x = 1 Opening Left along y =0
the vertex form of a Parabola opening left(a<0), {{{x=a(y-k)^2 + h}}}
{{{x=a(y)^2 + h}}}  p = -1 (1 -1))/2  = 0 = h
{{{x=a(y)^2 }}} a = 1/(4p) = 1/4(-1) = -1/4
{{{x=(-1/4) (y)^2 }}}