Question 1041120
{{{y=-2(x^2-4x)-5}}}
{{{y=-2(x^2-4x+4)-5+2(4)}}}
{{{y=-2(x-2)^2+3}}}
{{{-2(x-2)^2+3=0}}}
{{{2(x-2)^2=3}}}
{{{(x-2)^2=3/2}}}
{{{x-2=0 +- sqrt(3/2)}}}
{{{x=2 +- sqrt(6)/2}}}
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*[illustration dfc22.JPG].