Question 1073646
I assume you mean {{{y=-2x^2-8x-5}}}
Complete the square,
{{{y=-2(x^2+4x)-5}}}
{{{y=-2(x^2+4x+4)-5+2(4)}}}
{{{y=-2(x+2)^2-5+8}}}
{{{y=-2(x+2)^2+3}}}
(-2,3)
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*[illustration L16.JPG].