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Let f : R – ⎭ ⎬ ⎫ ⎩ ⎨ ⎧ − 2 1 → R and g : R – ⎭ ⎬ ⎫ ⎩ ⎨ ⎧ − 2 5 → R be defined as f(x) = 1 x 2 3 x 2 + + and g(x) = 5 x 2 1 x + + . Then, the domain of the function fog is :

1. R
2. R – ⎭ ⎬ ⎫ ⎩ ⎨ ⎧ − 2 5
3. R – ⎭ ⎬ ⎫ ⎩ ⎨ ⎧ − 4 7
4. R – ⎭ ⎬ ⎫ ⎩ ⎨ ⎧ − − 4 7 , 2 5

Correct answer: R – ⎭ ⎬ ⎫ ⎩ ⎨ ⎧ − 2 5

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