Question

if f(x)=x^2-x and g (x) = x-1, what is f(g(x))

Answer 1

f(x)=x^2-x and g (x) = x-1
Start with
f(x)=x^2-x
replace all appearance of x with g(x)=(x-1):
f(g(x)) = (x-1)^2-(x-1)
Expand and get your answer.