Hi,

the vertex form of a Parabola opening up(a>0) or down(a<0),  

where(h,k) is the vertex  and  x = h  is the Line of Symmetry



Parabola opening Downward a = -1 < 0

y= -x^2+1  V(0,1) x = 0 the line of symmetry &  When y = 0,  x = ± 1 



 

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