Nonlinear Functions

$f(x) = x(x+1)(x-2)^2$. $f(1) = 1 \cdot 2 \cdot (-1)^2 = 2$. Hmm, that gives $2$. So correct should be $2$. Recheck: $f(1) = 1 \cdot 2 \cdot 1 = 2$. So index 1 should be correct. Let me make answer index 1.