Question 810846
{{{y=a(x-h)^2+k}}}
a is the coefficient
(h,k) is the vertex
{{{y=a(x+2)^2-3}}}
plug the x and y values into the equation to find a.
{{{-2=a(-5+2)^2-3}}}
{{{-2=9a-3}}}
{{{1=9a}}}
{{{a=1/9}}}
The coefficient is 1/9.