Question

What is f(f(x))
what is the answer

Answer 1

Answer: f(f(x))=x^4+2x^2+2

Explanation:

f(x)=x^2+1

f(f(x))=(x^2+1)^2+1

f(f(x))=(x^2+1)(x^2+1)+1

f(f(x))=x^4+x^2+x^2+1+1

f(f(x))=x^4+2x^2+2 ==> 2nd option