help with question 60

In Exercises 57-60, determine all values of x at which the func- tion is discontinuous. 2x 57. f ( x) = 58. f(x) = - 1 (x - 1)(x - 2) x2 - 2x x2 - 3x + 2 59. f(x) = 60. f(x) x2 - 3x + 2 x2 - 2x