Question 957215
{{{y=3(x-2)^2-(x-5)^2}}}
{{{y=3(x^2-4x+4)-(x^2-10x+25)}}}
{{{y=3x^2-12x+12-x^2+10x-25}}}
{{{y=2x^2-2x-13}}}
{{{y=2(x^2-x)-13}}}
{{{y=2(x^2-x+1/4)-13-2(1/4)}}}
{{{y=2(x-1/2)^2-26/2-1/2}}}
{{{y=2(x-1/2)^2-27/2}}}