Question 534401
f(x) = -(x+3)^2 -9
f(x) = -(x^2 +6x +9) -9
f(x) = -x^2 -6x -9 -9
f(x) = -x^2 -6x -18
.
axis of symmetry
-b/2a = -(-6)/(2*(-1)) = 6/-2 = -3
.
vertex is on the axis of symmetry
-(-3)^2 -6(-3) -18 = -9+18-18 = -9
(-3,-9)
.
{{{ graph(500,500,-10,5,-20,5,-x^2-6*x-18) }}}