Which equation has a graph that is a parabola with a vertex at (-2,0)

The equation of a parabola with a vertex at (h,k) is
f(x)=a(x-h)+k
where a is a constant not equal to zero.
So for (h,k)=(-2,0), the general equation is
y=f(x)=a(x--2)^2+0,

y=a(x+2)^2, or
If a=1 and expand, 
y=x^2+4x+4

6xy and -16xy000000000

Bis the correct answer