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JEE Main & Advanced Mathematics Functions Question Bank Functions

  • question_answer
    If \[f(x)=2x\] and g is identity function, then

    A)                    \[(fog)(x)=g(x)\]

    B)            \[(g+g)(x)=g(x)\]

    C)                    \[(fog)(x)=(g+g)(x)\]

    D)            None of these

    Correct Answer: C

    Solution :

               \[(fog)x=2[g(x)]\] and \[(g+g)\,x=2\,[g(x)].\]


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