Q2 Help please

Question 2 Given the function f (x) - x - 2 a) Show that f (x) = (x_z)a by using the definition of the derivative. b) At which point(s) does the tangent line to the curve y = f(x) have a slope of -2? H c) Find the equation(s) of the tangent line(s) to the curve y = f (x) at the point(s) in b). d) Calculate the horizontal asymptote(s) of f