where is the following expression in undefined??
(x+1)(x-2)/x^2-25
The way you typed it, it would be undefined for x = 0
if you meant:
(x+1)(x-2)/(x^2-25)
then it would be undefined for x = ± 5
(x+1)(x-2)/x^2-25
if you meant:
(x+1)(x-2)/(x^2-25)
then it would be undefined for x = ± 5