The value of f4 if fx- 21-x is

The correct option is A 25 f(x)=21+x f(4)= 21+4= 25 ...

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Standard XII

Mathematics

Definition of Functions

The value of ...

Question

The value of $f (4)$ if $f (x) = \frac{2}{1 + x}$ is

\frac{2}{5}

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\frac{5}{2}

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\frac{3}{5}

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\frac{6}{5}

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Solution

The correct option is A $\frac{2}{5}$
$f (x) = \frac{2}{1 + x}$

$f (4) = \frac{2}{1 + 4} = \frac{2}{5}$

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Let N = $\frac{4^{5} + 4^{5} + 4^{5} + 4^{5}}{3^{5} + 3^{5} + 3^{5}} \cdot \frac{6^{5} + 6^{5} + 6^{5} + 6^{5} + 6^{5} + 6^{5}}{2^{5} + 2^{5}}$ then the value of ${log}_{2} N$ =

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The value of f(4) if f(x)=21+x is

The correct option is A 25f(x)=21+xf(4)=21+4=25

The value of $f (4)$ if $f (x) = \frac{2}{1 + x}$ is

The correct option is A $\frac{2}{5}$
$f (x) = \frac{2}{1 + x}$

$f (4) = \frac{2}{1 + 4} = \frac{2}{5}$