Question 1111615
{{{y=a(x-2)^2-4}}}

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{{{y+4=a(x-2)^2}}}
{{{(y+4)/(x-2)^2=a}}}
{{{a=(-3+4)/(-3-2)^2}}}
{{{a=1/(-5)^2}}}
{{{a=1/25}}}

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{{{highlight_green(y=(highlight(1/25))(x-2)^2-4)}}}