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4. Find the solution to each of these recurrence relations and initial conditions.a) an = −an−1, a0 = 5 b) an = an−1 + 3, a0 = 1 c) an = an−1 − n, a0 = 4d ) an = 2nan−1, a0 = 3 e) an = 5an−1 − 6an−2, a0 = 2, a1 = −1

Question

  1. Find the solution to each of these recurrence relations and initial conditions.a) an = −an−1, a0 = 5 b) an = an−1 + 3, a0 = 1 c) an = an−1 − n, a0 = 4d ) an = 2nan−1, a0 = 3 e) an = 5an−1 − 6an−2, a0 = 2, a1 = −1
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Solution

a) an=an1,a0=5 a_n = -a_{n-1}, a_0 = 5

Para encontrar la solución, observamos el patrón de los primeros términos:

  • a0=5 a_0 = 5
  • a1=a0=5 a_1 = -a_0 = -5
  • a2=a1=5 a_2 = -a_1 = 5
  • a3=a2=5 a_3 = -a_2 = -5

Podemos ver que los términos alternan entre 5 y -5. Por lo tanto, la solución es: an=5(1)n a_n = 5(-1)^n

b) an=an1+3,a0=1 a_n = a_{n-1} + 3, a_0 = 1

Para encontrar la solución, observamos el patrón de los primeros términos:

  • a0=1 a_0 = 1
  • a1=a0+3=4 a_1 = a_0 + 3 = 4
  • a2=a1+3=7 a_2 = a_1 + 3 = 7
  • a3=a2+3=10 a_3 = a_2 + 3 = 10

Podemos ver que los términos forman una progresión aritmética con diferencia común 3. La fórmula general es: an=a0+3n=1+3n a_n = a_0 + 3n = 1 + 3n

c) an=an1n,a0=4 a_n = a_{n-1} - n, a_0 = 4

Para encontrar la solución, observamos el patrón de los primeros términos:

  • a0=4 a_0 = 4
  • a1=a01=3 a_1 = a_0 - 1 = 3
  • a2=a12=1 a_2 = a_1 - 2 = 1
  • a3=a23=2 a_3 = a_2 - 3 = -2

Podemos ver que los términos forman una secuencia decreciente. La fórmula general es: an=a0n(n+1)2=4n(n+1)2 a_n = a_0 - \frac{n(n+1)}{2} = 4 - \frac{n(n+1)}{2}

d) an=2nan1,a0=3 a_n = 2n a_{n-1}, a_0 = 3

Para encontrar la solución, observamos el patrón de los primeros términos:

  • a0=3 a_0 = 3
  • a1=21a0=6 a_1 = 2 \cdot 1 \cdot a_0 = 6
  • a2=22a1=24 a_2 = 2 \cdot 2 \cdot a_1 = 24
  • a3=23a2=144 a_3 = 2 \cdot 3 \cdot a_2 = 144

Podemos ver que los términos forman una secuencia factorial multiplicada por 3. La fórmula general es: [ a_n = 3 \cdot (2^n \cdot n!) \

This problem has been solved

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