Question 322526
{{{(a^2-b^2)/(a-b)=((a-b)(a+b))/(a-b)=(highlight((a-b))(a+b))/highlight((a-b))=(cross((a-b))(a+b))/cross((a-b))=a+b}}} 


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