Question

Given f (x) = -2x -5, find f (-1)

Answer 1

To find
`f(-1)` given the function
`f(x)=-2x-5,` you simply substitute
`-1` for
`x` in the function:

`f(-1) = -2(-1)-5`

Simplify:

`f(-1) =2-5=-3`

So,
`f(-1) =-3`

Answer 2

Answer: f(-1) = -3

Explanation:

In order to evaluate this function, I am going to plug in -1 for x:

`\bigstar\quad\sf{f(x)=-2x-5}`

`\bigstar\quad\sf{f(-1)=-2(-1)-5}`

`\bigstar\quad\sf{f(-1)=2-5}`

`\bigstar\quad\sf{f(-1)=-3}`

Therefore, f(-1) = -3.