JEE Main & Advanced Mathematics Functions Question Bank Continuity

  • question_answer
    The value of \[f(0)\], so that the function \[f(x)=\frac{{{(27-2x)}^{1/3}}-3}{9-3{{(243+5x)}^{1/5}}},\,(x\ne 0)\]is continuous, is given by

    A)            \[2/3\]

    B)            6

    C)            2

    D)            4

    Correct Answer: C

    Solution :

               Since \[f(x)\] is continuous at \[x=0,\] therefore                    \[f(0)=\underset{x\to 0}{\mathop{\lim }}\,\,f(x)=\underset{x\to 0}{\mathop{\lim }}\,\,\frac{{{(27-2x)}^{1/3}}-3}{9-3\,{{(243+5x)}^{1/5}}}\,\],  \[\left( \text{Form}\frac{\text{0}}{\text{0}} \right)\]                  \[=\underset{x\to 0}{\mathop{\lim }}\,\,\,\frac{\frac{1}{3}\,{{(27-2x)}^{-2/3}}(-2)}{-\frac{3}{5}\,{{(243+5x)}^{-4/5}}(5)}=2.\]


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