Question

Find the value of f(-1) if f(x) = 3x2 + 5x + 1

Answer 1

If
`f(x) = 3 x^(2) + 5x+1` and you need to get the value of f(-1) all you need to do is substitute x with -1.

So your equation should look like this:


`f(-1) = 3 (-1)^(2) + 5(-1)+1` Then we just do the operations presented

`= 3(1) + (-5)+1`

`= 3 +(-5) +1`

`= (-2)+1`

`= -1`

The value then of f(-1) = -1