SOLUTION: Write 7 Σ81(-1/3)^(k-2) k=2 in expanded form. then find the sum the sum is (182/3) i dont know how to do expanded

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Question 1035561: Write
7
Σ81(-1/3)^(k-2)
k=2
in expanded form. then find the sum
the sum is (182/3)
i dont know how to do expanded
Answer by Edwin McCravy(20056)   (Show Source): You can put this solution on YOUR website!

You just substitute k=2 through k=7 in the expression after  
the Σ, then add them all.

Start by substituting k=2 in





Substitute k=3 in





Substitute k=4 in





Substitute k=5 in





Substitute k=6 in





Substitute k=7 in






Now sum them all up:






Edwin
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