Q. Which word best describes this formula for the sequence an?an=6an−1+5an−3+8n2−17Choices:(A) explicit(B) recursive
Examine Formula: Look at the formula: an=6an−1+5an−3+8n2−17. Does it use previous terms of the sequence? Yes, it uses an−1 and an−3, which are earlier terms in the sequence.
Implicit or Explicit?: Since the formula uses previous terms, it's not explicit. An explicit formula would directly calculate an based on n alone.
Recursive Definition: The formula is recursive because it defines a term based on previous terms in the sequence.
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