Question 964159
{{{f(x)=x^2+4x+9}}}
{{{f(x)=(x-3)^2+4(x-3)+9}}}
{{{f(x)=x^2-6x+9+4x-12+9}}}
{{{f(x)=x^2-2x+6}}}
ANSWER: The correct choice is (a.).