Answer :

SOLUTION:

Case: Geometric sequence

Method:

Sequence: -1, -2, -4, -8, ...

1. Type: Geometric/ Exponential sequence

2. Since the common ratio is 2. The recursive function is:

[tex]\begin{gathered} a_n=a_{n-1}\cdot r \\ a_n=a_{n-1}\cdot2 \end{gathered}[/tex]

3. The value of a1 (first term)

[tex]a_1=-1[/tex]

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