Question 266385
f(x)=-(x+4)^2+9
f(x)=-(x^2+8x+16)+9
f(x)=-x^2-8x-16+9
f(x)=-x^2-8x-7 complete the square. 
x^2+8x+16=-7+16
(x+4)^2=9
x+4=0
x=-4
Axis of symetry is x=-4
{{{ graph( 300, 200, -6, 5, -10, 10, -x^2 -8x -7) }}} (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, -x^2 -8x -7).