Question

If `f(x) = 5x` and `g(x) = 3x-7`, what is `g[f(4)]`?

Answer 1

`g[f(4)]=53`

Explanation:

As `f(x)=5x`, `f(4)=5×4=20`.

Now `g(x)=3x-7`, hence

`g[f(4)]=g[20]`

= `3×20-7=60-7`

= `53`