Question

Find $f(-1)$if,

$f\left(x\right)=2x^2-x$

Short answer

The value of$f(-1)$is$3$.

Step-by-step solution

Step 1. Given information.

The given function is,

$f\left(x\right)=2x^2-x$.

Step 2. Solving the function.

On substituting $x=-1$in the given function we get,

$$\begin{gathered} f(-1)=2{\left(-1\right)}^2-\left(-1\right) \\ =2\left(1\right)+1 \\ =2+1 \\ =3 \end{gathered}$$

Therefore the value,

$f(-1)=3$.