What is the completely factored form of f(x) = – 2 – 5 + 6? f(x) = (+ 2)( – 3)( + 6) f(x) = (+ 2)( – 3)( – 6) f(x) = (– 2)( + 3)( – 1) f(x) = (+ 2)( – 3)( – 1)