Question 991360
{{{(y + 4)^2-2(y + 4) + 1=(y^2+8y+16)+(-2y-8) + 1}}}
{{{(y + 4)^2-2(y + 4) + 1=y^2+6y+9}}}
{{{(y + 4)^2-2(y + 4) + 1=(y+3)^2}}}