Lindhmickaylie Lindhmickaylie

05-07-2016
Mathematics

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what is the sum of the first six terms of the geometric series 4 − 12 36 − . . . ?

Respuesta :

05-07-2016

The formula to use for the sum of n terms is as follows:
[tex]S_{n}=\frac{a(1-r^{n})}{1-r}[/tex]
r = -3, n = 6.
[tex]S_{6}=\frac{4(1-(-3)^{6})}{1-(-3)}=-728[/tex]

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