[tex]f:\mathbb_{R}\rightarrow \mathbb_{R},\quad $ $ f(x) = x^2-3x+2 \\ \\ x^2-3x+2 = x^2-x-2x-2 = x(x-1)-2(x-1) = (x-1)(x-2) \\ \Rightarrow x_1 = 1, \quad x_2 = 2\\ \\ f (0) \times f (1) \times ... \times f (2015) = f(0)\times 0\times0\times f(3)\times ...\times f(2015) = 0[/tex]
