Question

If f(x)= 3x^2+2x-1 find the value of f(-1) you must show all work including all substitutions

Answer 1

f(-1)=0

Explanation:

f(-1)=3(-1)^2-2(-1)-1=0

Answer 2

`f(-1)=0`

Explanation:

1. Write the expression of the function.

`f(x)=3x^(2) +2x-1`

2. Substitute the value of x.

`f(-1)=3(-1)^(2) +2(-1)-1`

3. Calculate and simplify.

`f(-1)=3(1) -2-1\\ \\f(-1)=3 -2-1\\ \\f(-1)=0`

4. Express your answer.

`f(-1)=0`