Asecret formula for eternal youth, f (x), was discovered by dr. quick, who has been working in our biotech company. however, dr. quick has disappeared and is rumored to be negotiating with a rival organization. from the notes that dr. quick left behind in his hasty exit it is clear that f (0) = 0, f (1) = 2, and that f [x0,x1,x2] = 1 for any three points x0,x1,x2. find f (x).