What is the domain of f(x)=x+1x2+5x+6f(x) = \dfrac{x+1}{x^2 + 5x + 6}f(x)=x2+5x+6x+1?
All real numbers except x=−2x = -2x=−2 and x=−3x = -3x=−3
All real numbers except x=2x = 2x=2 and x=3x = 3x=3
All real numbers except x=−1x = -1x=−1
All positive real numbers