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Lesson 21-2 Formulas for Geometric Sequences Check Your Understanding Write a recursive formula for each geometric sequence. Include the recursive formula in function notation. 4. 64, 16, 4, 1,... 5. 64, -16, 4, -1,... 6. -1, 1, -1, 1,... 7. Use the recursive formula to find $a_6$, $a_7$, and $a_8$ for the viral video sequence. Explain your results. $a_6 = 246$ $a_7 = 729$ $a_8 = 2,187$ 8. Why might it be difficult to find the 100th term of the viral video sequence using the recursive formula? As with arithmetic sequences, geometric sequences can be represent explicit formulas. The terms in a geometric sequence can be writter product of the first term and a power of the common ratio. . For the viral video sequence, identify $a_1$ and $r$. Then fill in th exponents and blanks.

          Lesson 21-2
Formulas for Geometric Sequences
Check Your Understanding
Write a recursive formula for each geometric sequence. Include the
recursive formula in function notation.
4. 64, 16, 4, 1,...
5. 64, -16, 4, -1,...
6. -1, 1, -1, 1,...
7. Use the recursive formula to find $a_6$, $a_7$, and $a_8$ for the viral video
sequence. Explain your results.
$a_6 = 246$
$a_7 = 729$
$a_8 = 2,187$
8. Why might it be difficult to find the 100th term of the viral video
sequence using the recursive formula?
As with arithmetic sequences, geometric sequences can be represent
explicit formulas. The terms in a geometric sequence can be writter
product of the first term and a power of the common ratio.
. For the viral video sequence, identify $a_1$ and $r$. Then fill in th
exponents and blanks.

Lesson 21-2
Formulas for Geometric Sequences
Check Your Understanding
Write a recursive formula for each geometric sequence. Include the
recursive formula in function notation.
4. 64, 16, 4, 1,...
5. 64, -16, 4, -1,...
6. -1, 1, -1, 1,...
7. Use the recursive formula to find a6, a7, and a8 for the viral video
sequence. Explain your results.
a6 = 246
a7 = 729
a8 = 2,187
8. Why might it be difficult to find the 100th term of the viral video
sequence using the recursive formula?
As with arithmetic sequences, geometric sequences can be represent
explicit formulas. The terms in a geometric sequence can be writter
product of the first term and a power of the common ratio.
. For the viral video sequence, identify a1 and r. Then fill in th
exponents and blanks.

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