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(-1)^(n+1) + (-1)^n-1)=?
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5 votes
(-1)^(n+1) + (-1)^n-1)=?

User Lekterable
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2 Answers

5 votes

(-1)^(n+1)+(-1)^(n-1)=(-1)^n\cdot(-1)^1+(-1)^n\cdot(-1)^(-1)\\\\=(-1)^n\cdot(-1)+(-1)^n\cdot(-1)=-(-1)^n+[-(-1)^n]\\\\=\boxed{-2(-1)^n}
User Jon Deokule
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7 votes
Hello,


(-1)^(n+1) + (-1)^(n-1) = (-1)^(n-1) ((-1)^2+1)= 2*(-1)^(n-1)
User Matheeeny
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