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Explicit formulas for arithmetic sequences

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Problem

Carlos and Ana were asked to find an explicit formula for the sequence minus, 10, comma, minus, 4, comma, 2, comma, 8, comma, point, point, point, where the first term should be f, left parenthesis, 1, right parenthesis.
Carlos said the formula is f, left parenthesis, n, right parenthesis, equals, minus, 10, plus, 6, n.
Ana said the formula is f, left parenthesis, n, right parenthesis, equals, minus, 10, plus, 6, left parenthesis, n, minus, 1, right parenthesis.
Which one of them is right?
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Choose 1 answer:
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