Question

If f(x)=5x+1 and g(x)=2f(x)+5 then g(-1)=

Answer 1

We know f(x)=5x+1. Plug in f(x) in the g(x) function.
We get
`g(x)=2(5x+1)+5` Distribute the 2 to 5x and 1.

`g(x)=10x+2+5`
Simplify to get
`g(x)=10x+7`
Now, we plug in -1 for x.

`g(-1)=10(-1)+7`

`g(-1)=-10+7`

`g(-1)=-3`