Question 970908
Complete the Square using  1.


{{{2(x^2-2x+1/2)}}}
{{{2(x^2-2x+1-1+1/2)}}}
{{{2((x-1)^2-1/2)}}}
{{{2(x-1)^2-1}}}


Vertex is (1,-1)


Zeros can be found solving the f(x)=0
....


{{{graph(300,300,-4,4,-4,4,2x^2-4x+1)}}}