If a=1/2(1+√5) show that a²-a-1=0
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Step-by-step explanation:
a=1/2(1+^5)
a=1/2+^5/2
LCM=2
1+^5/2
a²‐a-1=0
(^5/2)²‐^5/2‐1=0
5/4-^5/2‐1=0
=1‐2^5/4
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