(a)The graph of the function : f(x) = x3 + x2 - 6x is shown below : (a) Use the "alternate” definition of the derivative to determine the formula for f'(x). y=x(x-2)(x + 3)
(b)Use your result in part (a) to compute the slope of tangent line to the curve at each x-intercept. Sketch the tangent lines on the graph and label each mtan​