Find s8 for the following geometric sequence: 3, –6, 12, –24.

  = .

Step-by-step explanation:

Given  :  geometric sequence: 3, –6, 12, –24.

To find : Find s8 for the following geometric .

Solution : We have given geometric sequence: 3, –6, 12, –24.

Where, first term = 3, common ration : = -2.

Formula used  :  

Where, a = first term , r = common ratio.

= .

= .

= .

= .

= .

Therefore, = .

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