Hi,the vertex form of a parabola,  where(h,k) is the vertex      

finding the vertex by completing the square

y=2x^2+4x-1 

y = 2(x^2 + 2) - 1

y = 2[(x+1)^2-1} -  1

y = 2(x+1)^2 -2 -  1

y = 2(x+1)^2 -3

vertex is Pt(-1,-3)



 

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