Question

How do you find [f • g](x) and [g • f](x) if `F(x)= 2x + 7` and `G(x) = -5x - 1`?

Answer 1

`(f@g)(x)=-10x-5`
`(g@f)(x)=-10x-36`

Explanation:

`(f@g)(x)=f[g(x)]=f(-5x-1)=2(-5x-1)+7`
`=-10x+5`

`(g@f)(x)=g[f(x)]=g(2x+7)=-5(2x+7)-1`
`=-10x-36`