Question 550126
{{{(9a^2-b^2)/(3a-b)}}}



{{{((3a-b)(3a+b))/(3a-b)}}}



{{{(highlight((3a-b))(3a+b))/(highlight((3a-b)))}}}



{{{(cross((3a-b))(3a+b))/(cross((3a-b)))}}}



{{{3a+b}}}



So {{{(9a^2-b^2)/(3a-b)=3a+b}}}