Given f(x)=2x3 + 2x 8 verify that f(x) is invertible and, if so, find the equation of the tangent line to f-1(a) at the point where x = a) Of(a) is not invertible. 12. Note that f(2) = 12. 1 b) Oy+2= (x - 12) 26 1 c) Oy-2= (x - 12) 26 1 d) Oy-12= (x+2) 26 1 e) Oy-12= (x-2) 26