Question 1115016
{{{2x^2+4x-2}}}

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

Term to complete the square is  {{{(2/2)^2=1}}}, which should be added and subtracted inside the parentheses.

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

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

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


Remultiply to distribute the factor 2.

{{{2(x+1)^2-4}}}