Question

algebra problema 53 upt ​

Answer 1

Răspuns:

a)

Explicație pas cu pas:

$f(x) = \frac{x-1}{x+1}\\\\f(-x) = \frac{-x-1}{-x+1} = \frac{-1(x+1)}{-1(x-1)} = \frac{x+1}{x-1} = f(x)^{-1} = \frac{1}{f(x)}$