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What is the explicit formula that represents the geometric sequence -2, 8, -32, 128
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What is the explicit formula that represents the geometric sequence -2, 8, -32, 128

User Mahmoud Haj Ali
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a_n=a_1r^(n-1)\\\\a_1=-2;\ a_2=8;\ a_3=-32;\ a_4=128\\\\r=a_2:a_1\to r=8:(-2)=-4\\\\\boxed{a_n=-2\cdot(-4)^(n-1)}
User Reafidy
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