Hi,

y=x^2+6x+c

The value of c for which the vertex of the parabola will lie on the x-axis

y = (x - 3)^2 - 9  + c   |comleting the Square to put into Vertex form for:  V(-3,0)

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

where(h,k) is the vertex

  c = 9    and 



 

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