Critical numbers occur where \( g^{\prime}(y) \) equals 0 or is undefined. \( g^{\prime}(y) \) is undefined where the quadratic \( y^{2}-2 y+8 \) in the denominator is 0 , So, \( g^{\prime}(y) \) is undefined for the following values. (Enter your answers as a comma-separated list. If an answer does not exist, enter DNE.)