Find the 11th Term -8 , -24 , -72 , -216 , -648 , -1944 , -5832 , -17496 , -52488

$- 8$ , $- 24$ , $- 72$ , $- 216$ , $- 648$ , $- 1944$ , $- 5832$ , $- 17496$ , $- 52488$

Step 1

This is a geometric sequence since there is a common ratio between each term. In this case, multiplying the previous term in the sequence by $3$ gives the next term. In other words, $a_{n} = a_{1} r^{n - 1}$ .

Geometric Sequence: $r = 3$

Step 2

This is the form of a geometric sequence.

$a_{n} = a_{1} r^{n - 1}$

Step 3

Substitute in the values of $a_{1} = - 8$ and $r = 3$ .

$a_{n} = - 8 \cdot 3^{n - 1}$

Step 4

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

$a_{11} = - 8 \cdot 3^{(11) - 1}$

Step 5

Subtract $1$ from $11$ .

$a_{11} = - 8 \cdot 3^{10}$

Step 6

Raise $3$ to the power of $10$ .

$a_{11} = - 8 \cdot 59049$

Step 7

Multiply $- 8$ by $59049$ .

$a_{11} = - 472392$

Find the 11th Term -8 , -24 , -72 , -216 , -648 , -1944 , -5832 , -17496 , -52488

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