For the following geometric sequence find the explicit formula: {-1, 3, -9,...}
2 answers:
Answer:
= - 1 
Step-by-step explanation:
The explicit formula for a geometric sequence is
= a 
where a is the first term and r the common ratio
Here a = - 1 and r = 3 ÷ - 1 = - 3 , thus explicit formula is
= - 1 
Multiplies by -3 every time
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