Find the critical numbers of the function. (enter your answers as a comma-separated list. if an answer does not exist, enter dne.)
f(x) = x^−6 ln x

What is the range of the function? f(x)=-2|x+1|? a. all real numbers. b. all real numbers less than or equal to 0. c. all real numbers less than or equal to 1. d. all real numbers greater than or equal to 1