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Write the explicit formula for the geometric sequence a1=-5 a2=20 a3=-80

Write the explicit formula for the geometric sequence a1=-5 a2=20 a3=-80
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3 votes
Write the explicit formula for the geometric sequence a1=-5 a2=20 a3=-80

User Ptrck
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1 Answer

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The answer is a(n)=-5×(-4)n−1.

User Hamad
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