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Calcula las sumatorias sin usar fórmulas: (4 pts.)

1. [tex]\sum_{i=5}^8(3i+2)[/tex]


Sagot :

Para resolver la sumatoria [tex]\(\sum_{i=5}^8(3i + 2)\)[/tex], debemos calcular el valor de la expresión [tex]\(3i + 2\)[/tex] para cada valor de [tex]\(i\)[/tex] desde 5 hasta 8, y luego sumar los resultados.

Primero desglosamos la sumatoria:

1. Para [tex]\(i = 5\)[/tex]:
[tex]\[ 3(5) + 2 = 15 + 2 = 17 \][/tex]

2. Para [tex]\(i = 6\)[/tex]:
[tex]\[ 3(6) + 2 = 18 + 2 = 20 \][/tex]

3. Para [tex]\(i = 7\)[/tex]:
[tex]\[ 3(7) + 2 = 21 + 2 = 23 \][/tex]

4. Para [tex]\(i = 8\)[/tex]:
[tex]\[ 3(8) + 2 = 24 + 2 = 26 \][/tex]

Ahora, sumamos todos estos resultados:
[tex]\[ 17 + 20 + 23 + 26 \][/tex]

Sumamos paso a paso:

[tex]\[ 17 + 20 = 37 \][/tex]
[tex]\[ 37 + 23 = 60 \][/tex]
[tex]\[ 60 + 26 = 86 \][/tex]

Por lo tanto, el valor de la sumatoria [tex]\(\sum_{i=5}^8(3i + 2)\)[/tex] es [tex]\(86\)[/tex].