Given f(x) = x³ − 2x² + x − 7

i) Find the stationary values of the function
ii) Find the equation of the tangent line to the curve at the point (0,-7)
iii) Draw the graph of this function for −2 ≤ x ≤ 3 and indicate on the graph the stationary
points and the equation of the tangent line obtained in part ii).