Use the derivative of the function y=f(x) to find the points at
which f has a local maximum, local minimum or point of
inflection. y ' = 6(x+1)(x-2)^2 help me with this problem, thank
you You already know that * At an extremum, That is . To know
the nature of these points we compute the second order
derivative. If x = -1 then and we have a minimum. If x = 2 then
and we have a point of inflection. We also have a point of
inflection at x=0 because .