1. For what value(s) of x is f(x) = (x-1) / (x^2 - 1) discontinuous?

2.) f(x) = (1)/(x^2) is continuous for all real numbers EXCEPT:

a. x=0
b. x=1 only
c. x=1 and x=-1
d. x=-1 only
e. x=2

1 answer

look at example 2:
1. hint: removable discontinuity

http://tutorial.math.lamar.edu/Classes/CalcI/Continuity.aspx