Exercise ID121

Algebra → Exponents → Powers
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Evaluate the following expression:

a-nan-1-1-2a2n-1-1+a-nan+1-1

a-nan-1-1-2a2n-1-1+a-nan+1-1 =1an·1an-1-2a2n-1+1an·1an+1 =1anan-1-2an-1an+1+1anan+1 =an+1-2an+an-1anan-1an+1 =2an-2an+1-1anan-1an+1 =0anan-1an+1 =0
a-nan-1-1-2a2n-1-1+a-nan+1-1=0
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