What problems are you having? What's your working so far?
Letf(x) = (x + 1)^2(x-2).
(a) Find the maximum and minimum values of f(x);
(b) A point of inflection is a point where the graph changes direction of
concavity, i.e. a point where f''(x) = 0. Find the inection point(s) of
f, and determine where the function is concave up and concave down
In other words:
So, find f'(x), set it equal to zero, and solve for x. This will give you the x co-ordinates of the maxima/minima. THEN plug that value back into the original equation, f(x), to find the y value. (y=f(x)).