tristafortson tristafortson

09-06-2020
Mathematics

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Find the sum of the first 14 terms for the sequence -2,10,-50,....

Respuesta :

surjithayer10 surjithayer10

09-06-2020

Answer:

Step-by-step explanation:

a=-2

r=10/-2=-5

[tex]s_{14}=a\frac{r^n-1}{r-1} \\=-2\frac{(-5)^{14}-1}{-5-1} \\ =\frac{1}{3}(5^{14}-1)\\=\frac{6103515625-1}{3}\\=\frac{6103515624}{3}\\=2034505208[/tex]

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