What is the explicit formula for this arithmetic sequence?–11, –18, –25, –32, ...A.an = –11 + (n – 1)7B.an = –11 + (n – 1)(–7)C.an = –7 + (n – 1)(–11)D.an = 11 + (n – 1)(–7)
Question
What is the explicit formula for this arithmetic sequence?–11, –18, –25, –32, ...A.an = –11 + (n – 1)7B.an = –11 + (n – 1)(–7)C.an = –7 + (n – 1)(–11)D.an = 11 + (n – 1)(–7)
Solution
Para encontrar la fórmula explícita de una secuencia aritmética, necesitamos identificar el primer término y la diferencia común.
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Identificar el primer término (a1): El primer término de la secuencia es –11.
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Calcular la diferencia común (d): La diferencia común se obtiene restando cualquier término del término anterior. –18 - (–11) = –18 + 11 = –7 –25 - (–18) = –25 + 18 = –7 –32 - (–25) = –32 + 25 = –7
La diferencia común es –7.
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Usar la fórmula general de una secuencia aritmética: La fórmula general para el n-ésimo término de una secuencia aritmética es:
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Sustituir los valores en la fórmula:
Por lo tanto, la fórmula explícita para la secuencia es: B.
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