Question

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.

Answer 1

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' .