F (x) = x2 + 1

What is f (f (x)) ?

O x + 2x²+1

O x + 2x²+2

x + 2

x+1

It's x^4+2x^2+2

Step-by-step explanation:

The argument of f (f (x)) function becomes x^2+1-> F = (x^2+1) ^2+1 Opening the brackets you get my answer. Not sure if O sign stood for ^4.