Question 986354
{{{-2(x^2-18x)}}}
{{{-2(x^2-18x+(18/2)^2-(18/2)^2)}}}
{{{-2(x^2-18x+9^2-9^2)}}}
{{{-2((x-9)^2-9^2)}}}
{{{-2(x-9)^2+2*9^2}}}
{{{-2(x-9)^2+162}}}