Question 315090
{{{9-x^2=(3-x)(3+x)}}}
{{{(9-x^2)/(x-3)=((3-x)(3+x))/(x-3)}}}
{{{(9-x^2)/(x-3)=(-(x-3)(3+x))/(x-3)}}}
{{{(9-x^2)/(x-3)=(-cross((x-3))(3+x))/cross((x-3))}}}
{{{(9-x^2)/(x-3)=-(3+x)}}}
{{{(9-x^2)/(x-3)=-x-3}}}