Kenji Kenji
  • 01-10-2024
  • Mathematics
High School

What is the sum of the geometric sequence -4, 24, -144, ... if there are 7 terms?

A. -159,964
B. -26,661
C. 26,661
D. 159,963

Answer :

faryna faryna
  • 06-10-2023

[tex] = \frac{ - 4( - 6) {}^{7} - 1 }{ 1 + 6} [/tex]
[tex] = \frac{ - 4( - 279936) - 1}{7} [/tex]
[tex] = \frac{1119744 - 1}{7} [/tex]
[tex] = \frac{1119743}{7} [/tex]
[tex] = 159963[/tex]

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