Find the 4th Term -13 , -9 , -5

$- 13$ , $- 9$ , $- 5$

Step 1

This is an arithmetic sequence since there is a common difference between each term. In this case, adding $4$ to the previous term in the sequence gives the next term. In other words, $a_{n} = a_{1} + d (n - 1)$ .

Arithmetic Sequence: $d = 4$

Step 2

This is the formula of an arithmetic sequence.

$a_{n} = a_{1} + d (n - 1)$

Step 3

Substitute in the values of $a_{1} = - 13$ and $d = 4$ .

$a_{n} = - 13 + 4 (n - 1)$

Step 4

Simplify each term.

Apply the distributive property.

$a_{n} = - 13 + 4 n + 4 \cdot - 1$

Multiply $4$ by $- 1$ .

$a_{n} = - 13 + 4 n - 4$

Step 5

Subtract $4$ from $- 13$ .

$a_{n} = 4 n - 17$

Step 6

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

$a_{4} = 4 (4) - 17$

Step 7

Multiply $4$ by $4$ .

$a_{4} = 16 - 17$

Step 8

Subtract $17$ from $16$ .

$a_{4} = - 1$

Find the 4th Term -13 , -9 , -5

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