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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)

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Solution

Para encontrar la fórmula explícita de una secuencia aritmética, necesitamos identificar el primer término y la diferencia común.

  1. Identificar el primer término (a1): El primer término de la secuencia es –11.

  2. 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.

  3. Usar la fórmula general de una secuencia aritmética: La fórmula general para el n-ésimo término de una secuencia aritmética es: an=a1+(n1)d a_n = a_1 + (n - 1) \cdot d

  4. Sustituir los valores en la fórmula: an=11+(n1)(7) a_n = -11 + (n - 1) \cdot (-7)

Por lo tanto, la fórmula explícita para la secuencia es: B. an=11+(n1)(7) a_n = -11 + (n - 1)(-7)

This problem has been solved

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