Evaluate Using the Given Value f(-1)=2(-1)^2-(-1)-1

$f (- 1) = 2 {(- 1)}^{2} - (- 1) - 1$

Step 1

Simplify each term.

Raise $- 1$ to the power of $2$ .

$f (- 1) = 2 \cdot 1 - (- 1) - 1$

Multiply $2$ by $1$ .

$f (- 1) = 2 - (- 1) - 1$

Multiply $- 1$ by $- 1$ .

$f (- 1) = 2 + 1 - 1$

Step 2

Simplify by adding and subtracting.

Add $2$ and $1$ .

$f (- 1) = 3 - 1$

Subtract $1$ from $3$ .

$f (- 1) = 2$