Estimate the intervals on which the derivative is positive and the intervals on which the derivative is negative. enter your answers to one decimal place.

Here is the general strategy for identifying whether a derivative is positive or negative. First Let f (x) be a function of x, continuous and differential on a given interval 'I'. f' (x) is positive if f (x) is increasing on 'I'. f' (x) is negative if f (x) is decreasing on 'I'.