Question

$frac{87 ^{2} -39 ^{2} }{19 ^{2}-37 ^{2} } =$

Answer 1

$frac{87 ^{2} -39 ^{2} }{19 ^{2}-37 ^{2} } =frac{(87-39)(87+39)}{(19-37)(19+37)}=frac{48*126}{-18*56}=frac{7*6}{-7}=-6$