Question

se f(x) =1+x/1-x então f(-1) e igual a:
a)-1
b)3
c)0
d)-2

Answer 1

$f( - 1) = \frac{1 + x}{1 - x} \\ f( - 1) = \frac{1 + ( - 1)}{1 - ( - 1)} \\ f( - 1) = \frac{1 - 1}{1 + 1} \\ f( - 1) = \frac{0}{2}$

R= Letra C.