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Let f : R → R be defined by f(x) = 2 x 1 x + , x ∈ R. Then the range of f is

1. ⎥ ⎦ ⎤ ⎢ ⎣ ⎡ − 2 1 , 2 1
2. R – ⎥ ⎦ ⎤ ⎢ ⎣ ⎡ − 2 1 , 2 1
3. (–1, 1) – {0}
4. R – [–1, 1]

Correct answer: ⎥ ⎦ ⎤ ⎢ ⎣ ⎡ − 2 1 , 2 1

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