# Given f(x)=-4x+2, how do you find f(x) when x=-1?

Mar 5, 2018

It is $6$.

#### Explanation:

Just plug $- 1$ in for $x$ in the equation and it gives you the answer

$f \left(- 1\right) = - 4 \times \left(- 1\right) + 2 = 4 + 2 = 6$

Mar 5, 2018

$f \left(- 1\right) = 6$

#### Explanation:

$\text{substitute "x=-1" into } f \left(x\right)$

$\Rightarrow f \left(\textcolor{red}{- 1}\right) = \left(- 4 \times \textcolor{red}{- 1}\right) + 2$

$\textcolor{w h i t e}{\Rightarrow f \left(- 1\right)} = 4 + 2 = 6$