Find the 5th Term -9 , -4 , 1 , 6

$- 9$ , $- 4$ , $1$ , $6$

Step 1

This is an arithmetic sequence since there is a common difference between each term. In this case, adding $5$ to the previous term in the sequence gives the next term. In other words, $a_{n} = a_{1} + d (n - 1)$ .

Arithmetic Sequence: $d = 5$

Step 2

This is the formula of an arithmetic sequence.

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

Step 3

Substitute in the values of $a_{1} = - 9$ and $d = 5$ .

$a_{n} = - 9 + 5 (n - 1)$

Step 4

Simplify each term.

Apply the distributive property.

$a_{n} = - 9 + 5 n + 5 \cdot - 1$

Multiply $5$ by $- 1$ .

$a_{n} = - 9 + 5 n - 5$

Step 5

Subtract $5$ from $- 9$ .

$a_{n} = 5 n - 14$

Step 6

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

$a_{5} = 5 (5) - 14$

Step 7

Multiply $5$ by $5$ .

$a_{5} = 25 - 14$

Step 8

Subtract $14$ from $25$ .

$a_{5} = 11$

Find the 5th Term -9 , -4 , 1 , 6

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