Q. Which word best describes this formula for the sequence an?an=−4an−1+an−4−12n2−13n+14Choices:(A)explicit(B)recursive
Identify Formula Type: The formula given is an=−4an−1+an−4−12n2−13n+14. We need to determine if it's explicit or recursive.
Explicit vs Recursive: An explicit formula provides a way to find the nth term without knowing any other terms in the sequence. A recursive formula provides a way to find the nth term using one or more previous terms.
Dependence on Previous Terms: The formula has terms like an−1 and an−4, which are previous terms in the sequence. This means the current term an is defined using previous terms.
Conclusion: Since the formula depends on previous terms, it is a recursive formula.
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