KVPY Sample Paper KVPY Stream-SX Model Paper-16

  • question_answer
    If  \[f(x)={{(a{{x}^{2}}+b)}^{3}}\] then a function g(x) such that f(g(x)) =g (f(x)) is given by -

    A) \[g(x)={{\left( \frac{b-{{x}^{1/3}}}{a} \right)}^{1/2}}\]

    B) \[g(x)=\frac{1}{{{(a{{x}^{2}}+b)}^{3}}}\]

    C) \[g(x)={{(a{{x}^{2}}+b)}^{1/3}}\]

    D) \[g(x)={{\left( \frac{{{x}^{1/3}}-b}{a} \right)}^{1/2}}\]

    Correct Answer: D

    Solution :

    \[f(x)={{(a{{x}^{2}}+b)}^{3}}=y\]
    \[\Rightarrow x=\pm {{\left( \frac{{{y}^{\frac{1}{3}}}-b}{a} \right)}^{\frac{1}{2}}}\]
    \[\therefore g(x)={{\left( \frac{{{x}^{1/3}}-b}{a} \right)}^{1/2}}\]


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