For the function f(x)=x+2x2+3x+2f(x) = \frac{x+2}{x^2+3x+2}f(x)=x2+3x+2x+2, at which value(s) of xxx is fff discontinuous?
x=−1x = -1x=−1 and x=−2x = -2x=−2
x=1x = 1x=1 and x=2x = 2x=2
x=−2x = -2x=−2 only
x=−1x = -1x=−1 only