I know the right answer is B)
but can someone explain how to solve this step by step please
f(x) = x² +1
(fog)(x) = 2x²-1
f(4) = ?
A) 4
B) 5
C) 17
D) 31
![I know the right answer is B but can someone explain how to solve this step by step please fx x 1 fogx 2x1 f4 A 4 B 5 C 17 D 31 class=](https://us-static.z-dn.net/files/d7b/10476fa53895bb2f7566984782c24eb9.png)