(1)
f(0)=(0-1)/(0+1)=-1/1=-1
f(1/2)=(1/2-1)/(1/2+1)=(-1/2)/(3/2)=-1/3
f(√2)=(√2-1)/(√2+1√)=(√2-1)^2/(2-1)=3-2√2
(2)
(a-1)/(a+1)=2
a-1=2a+2
-a=3
a=-3
(1)
f(0)=(0-1)/(0+1)=-1/1=-1
f(1/2)=(1/2-1)/(1/2+1)=(-1/2)/(3/2)=-1/3
f(√2)=(√2-1)/(√2+1√)=(√2-1)^2/(2-1)=3-2√2
(2)
(a-1)/(a+1)=2
a-1=2a+2
-a=3
a=-3