Question 324822
{{{y-k=a(x-h)^2}}}
Plug the vertex in for (h,k)
{{{y-(-5)=a(x-1)^2}}}
{{{y+5=a(x-1)^2}}}
Now use the point (-4,3) to solve for {{{a}}}.
{{{3+5=a(-4-1)^2}}}
{{{8=a(-5)^2}}}
{{{a=8/25}}}
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{{{highlight(y+5=(8/25)(x-1)^2)}}}