15. Let f(x)=ax/(ax+1). Then for what value of a is f(f(x))=4x/(2x+1)

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f (x) = \frac{a x}{x + 1}

x \neq - 1

a

f (f (x)) = x

Let $f (x) = \frac{α x}{x + 1}, x \neq - 1$ . Then write the value of $α$ satisfying $f (f (x)) = x$ for all $x \neq - 1$ .

f (x) = \frac{a x}{x + 1}, x \neq - 1

If $f (x) = \frac{α x}{x + 1}, x \neq - 1$ then , for what value of $α$ is $f (f (x)) = x$

a - 2 b + c = 1

f (x) = ∣ ∣ ∣ ∣ \begin{matrix} x + a & x + 2 & x + 1 x + b & x + 3 & x + 2 x + c & x + 4 & x + 3 \end{matrix} ∣ ∣ ∣ ∣,

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