F when x < 1x > 2? (x) > 0 These two intervals increase monotonically.
F when 1 < x < 2? The interval (x) < 0 is monotonically decreasing.
F (x)=2-9+ 12-2=3 when the maximum value x= 1.
When the minimum value x=2, F (x)= 16-36+24-2=2.