What are the zeros of the function f(x) = x^2+4x+3? x = 4, x = 3 x = -1, x = 3 x = -1, x = -3 x = 1, x = 3

How many different three-digit numbers can be formed using the digits 1 comma 2 comma 9 comma 6 comma 4 comma 3 comma and 8 without repetition? for example, 664 is not allowed.