Question 937256
{{{ f(x)=-x^2+2x+5 }}}

{{{ f(x)= -(x-1)^2 + 6 }}}
{{{drawing(300,300,    -10,10,-10,10,  blue(line(1,10,1,-10))  ,  
 grid(1),
circle(1,6,0.4),
graph( 300, 300, -10,10,-10,10,0, -x^2+2x+5))}}}