Range of the function f (x) = x^ 2 +x+2 x^ 2 +x+1 ; x ∈ R is

Mathematics · JEE Main · NTA Exams — Sets, Relations and Functions

1. (1, ∞)
2. \(\left(1, \frac{11}{7}\right)\)
3. \(\left(1, \frac{7}{3}\right]\)
4. \(\left(1, \frac{7}{5}\right)\)

Answer

(C) (1, 7 3 ]

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