Question 134169
Simplify:
{{{(r^2-4r+4)/(4-r^2)}}} Factor the numerator and the denominator.
{{{((r-2)(r-2))/(2-r)(2+r)}}} Rearrange the denominator.
{{{(cross((r-2))(r-2))/(-cross((r-2))(r+2))}}} Cancel the indicated terms.
{{{-((r-2)/(r+2))}}}