Question 59458
f(x)=x^2-1  g(x)=1-2x  
f(g(-1))
g(-1)=1-2(-1)
g(-1)=1+2
g(-1)=3
f(g(-1))=f(3)=3^2-1=9-1=8
:
g(f(-1))
f(-1)=(-1)^2-1
f(-1)=1-1
f(-1)=0
g((f)(x))=g((f)(-1))=g(0)=1-2(0)=1
Happy Calculating!!!