Question

F(x)=x² +1
What is f(f(x))?

Answer 1

Explanation:

Plug

`{x}^(2) + 1`

for x.

`( {x}^(2) + 1) {}^(2) + 1`

Note that

`(a + b) {}^(2) = 2ab`

So we have

`{x}^(4) + 2 {x}^(2) + 2`