Which is the domain of f(x)=x−1x+2f(x) = \sqrt{\frac{x-1}{x+2}}f(x)=x+2x−1?
(−∞,−2)∪[1,∞)(-\infty, -2) \cup [1, \infty)(−∞,−2)∪[1,∞)
(−2,1](-2, 1](−2,1]
(−∞,−2]∪[1,∞)(-\infty, -2] \cup [1, \infty)(−∞,−2]∪[1,∞)
All real numbers except −2-2−2