Question 1180054
{{{2x^2 +8x -5= 0}}}
{{{(2x^2+8x)-5= 0}}}...factor out {{{2}}}
{{{2(x^2+4x)-5= 0}}}
{{{2(x^2+4x+b^2)-2b^2-5= 0}}}....{{{b=4/2=2}}}
{{{2(x^2+4x+2^2)-2*2^2-5= 0}}}
{{{2(x+2)^2-8-5= 0}}}
{{{2(x+2)^2-13= 0}}}

number should be added to the equation {{{13}}}