Determine whether function f is differentiable at x = -1. f (x) = x2 -11 If the function is differentiable, enter the value of f' (-1) . If the function is not differentiable, enter DNE. f' (-1) =Find all points on the graph of y = f (x) for which the tangent line passes through the point (1, -1). f (x) = 3x2 - 4x +3 points: 2 Incorrect