erinward62
erinward62 erinward62
  • 21-02-2017
  • Mathematics
contestada

-7+12-17+22-27
What is a possible expression for the series

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Аноним Аноним
  • 21-02-2017
just x-17 because you just reduce this in the calculator
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sqdancefan
sqdancefan sqdancefan
  • 07-08-2018

Signs start with a negative and alternate, so the general term will have (-1)^n as a factor. The common difference has a magnitude of 5, so the general term is

[tex]a_{n}=(-1)^{n}\cdot (7+5(n-1))[/tex]

and the sum is

[tex]\displaystyle S=\sum_{n=1}^{5}{(-1)^{n}\cdot (5n+2)}=-17[/tex]

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