(x^(2)+8x-20)/(x^(2)-4)
Simplify
(x^(2)+8x-20)/(x^(2)-4) factor
[ (x +10) ( x - 2) ] / [ ( x - 2) (x + 2 ) ] "cancel" the (x - 2) factor
( x + 10 ) / ( x + 2 )