Question 1084127
{{{f(x)=-2x^2+4x+3}}}
{{{f(x)=-2(x^2-2x)+3}}}
{{{f(x)=-2(x^2-2x+1)+3+2}}}
{{{f(x)=-2(x-1)^2+5}}}

Vertex : (1,5)
Axis of symmetry : {{{x=1}}}
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*[illustration CD2.JPG].