Hi, 

See highlighted

Note: the vertex form of a parabola is,  

where(h,k) is the vertex

F(x)=x^2-2x-3    |Completing the Square

F(x)=(x-1)^2 -1 - 3

F(x)=(x-1)^2 - 4     and If x = 0  then y = -3

If (x-1)^2 - 4 = 0 , x = 1  ±= 1  ± 2   , x =  -1, 3



 

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