Question 111500
f(x)=-3(x+2)^2+3
f(x)=-3(x^2+4x+4)+3
f(x)=-3x^2-12x-12+3
f(x)=-3x^2-12x-9
{{{ graph( 300, 200, -6, 5, -10, 10, y = -3x^2 -12x -9) }}} (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, y = -3x^2 -12x -9). 
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curve is decreasing.
vertex is (-2,3)
symetry is x=-2