Question 350650
USe the vertex form of a parabola, {{{y=a(x-h)^2+k}}}
{{{y=a(x-5)^2+7}}}
Now use the point (8,-2) to solve for {{{a}}}.
{{{-2=a(8-5)^2+7}}}
{{{a(9)=-9}}}
{{{a=-1}}}
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.
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{{{highlight(y=-(x-5)^2+7)}}}
or
{{{y=-(x^2-10x+25)+7)}}}
{{{highlight_green(y=-x^2+10x-18)}}}