Math Question ?

Function g(x)=-x^2+8x-16
vertex=(4,0)
Line of symmetry x=4
Domain (-inf,inf)
Range (-inf,0]
g(x)=0 when x=4

g(x) >0 = when x is in ? : none 
g(x)<0 when x is in ? : ____

Increasing (-inf,4)
Decreasing(4,inf)

2017-04-11T00:37:33.809Z