Find all the critical numbers of f(x) = x-4x+3x+2, then determine the local minimum and maximum points by using a graph. Critical number: x = 1 There is no local maximum or local minimum. Critical numbers: x = -1 and x = 1 O There is no local maximum or local minimum. Critical numbers: x = -1,x=0,x=1 O (0,2) is a local and global minimum. Critical numbers: x = 0 and x = 1 (0,2) is a local minimum.