$\"\"$

Given The first term of the sequence is 1 and the common ratio is is 9.

So, $\"\"$ .

$\"\"$

n th term of a geometric sequence: $\"\"$ .

Find the nth term of this sequence:

$\"\"$ (Substitute $\"\"$ ) $\"\"$

Find the ninth term of this sequence:

$\"\"$ (Substitute $\"\"$ )

$\"\"$ (Subtract: $\"\"$ )

$\"\"$ (Evaluate powers: $\"\"$ )

$\"\"$ (Apply multiplicative identity property: $\"\"$ )

$\"\"$

The eightth term of this sequence is $\"\"$ .