Algebra Examples

$a_{n} = 2 {(- 1)}^{n}$

Step 1

Substitute in the value of $n$ to find the $n$ th term.

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

Step 2

Evaluate the exponent.

$a_{1} = 2 \cdot - 1$

Step 3

Multiply $2$ by $- 1$ .

$a_{1} = - 2$