MCQ
વિધેય $f(x) = \log_2 \left( -\log_{\frac {1}{2}} \left( 1+\frac {1}{4 \sqrt x} \right)-1\right)$ નો પ્રદેશ
  • A
    $ x > 1$
  • B
    $ x \geq 1$
  • $ 0 < x < 1$
  • D
    $ 0 < x \leq 1 $

Answer

Correct option: C.
$ 0 < x < 1$
$ \log_{\frac {1}{2}} \left( 1 + \frac {1}{4 \sqrt x}\right)< -1$
$\frac {\log_e \left( 1 + \frac {1}{4 \sqrt x}\right)}{\log_e \frac {1}{2}}< -1$
$\therefore \left( 1 + \frac {1}{4 \sqrt x}\right) > (2^{-1})^{-1}=2$
$ \therefore \frac {1}{4 \sqrt x}> 1$ જો $ 0 < x < 1$
$f$ નો પ્રદેશ $ 0 < x < 1$
 

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