Algebra Examples

$D (- 1) = x^{2} - 2 x - 1$

Step 1

Replace the variable $x$ with $- 1$ in the expression.

$D (- 1) = {(- 1)}^{2} - 2 \cdot - 1 - 1$

Step 2

Simplify the result.

Tap for more steps...

Step 2.1

Simplify each term.

Tap for more steps...

Step 2.1.1

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

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

Step 2.1.2

Multiply $- 2$ by $- 1$ .

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

Step 2.2

Simplify by adding and subtracting.

Tap for more steps...

Step 2.2.1

Add $1$ and $2$ .

$D (- 1) = 3 - 1$

Step 2.2.2

Subtract $1$ from $3$ .

$D (- 1) = 2$

Step 2.3

The final answer is $2$ .

$2$

Step 3