Question

How do you find `(fog)(x)` given `f(x)=-9x+3` and `g(x)=x^4`?

Answer 1

`(fog)(x) =-9x^4+3`

Explanation:

`(fog)(x) -= f[g(x)]`

Here `f(x) = -9x+3` and `g(x) = x^4`

Hence: `f[g(x)]` = `f(x^4)`

`=-9x^4+3`