Question 998910
Start with the vertex form.
{{{y=a(x-h)^2+k}}}
{{{y=a(x-(-4))^2+(-6)}}}
{{{y=a(x+4)^2-6}}}
Now use the y-intercept to solve for {{{a}}}.
{{{2=a(0+4)^2-6}}}
{{{8=a(16)}}}
{{{a=8/16}}}
{{{a=1/2}}}
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{{{highlight_green(y=(x+4)^2/2-6)}}}
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*[illustration vx1.JPG].