Mathematics, 08.07.2019 20:00 bbanfield1
What is the sum of the first 11 terms of the geometric sequence: -4, 12, -36,
Answers: 1
![S_n=\dfrac{a_1(1-r^n)}{1-r}\\\\\text{We have:}\\a_1=-4,\ r=-3,\ n=11\\\\\text{Substitute:}\\\\S_{11}=\dfrac{-4[1-(-3)^{11}]}{1-(-3)}=\dfrac{-4(1+177147)}{4}=-177148\\\\\ -177,148](/tpl/images/0066/7672/b3564.png)
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What is the sum of the first 11 terms of the geometric sequence: -4, 12, -36,...
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