Question

F(x)=3x^2-4x
find f(-1)

Answer 1

`f(x) = 3 {x}^(2) - 4x \\ f( - 1) = 3 * { (- 1)}^(2) - 4 * - 1 \\ 3 + 4 \\ = 7 \\ thank \: you`

Answer 2

7

Explanation:

f(x)=3x^2-4x

Let x = -1

f(-1)=3(-1)^2-4(-1)

= 3(1) +4

= 7