if a2-5a-1=0and a=0 a+1/a
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A^2+5a_1=0
a^2_1=5a
a-1/a=5
(a+1/a)^2=(a-1/a)^2+4a×1/a
=5^2+4=29
a+1/a=root over 29
a^2_1/a^2=(a+1/a)(a-1/a)
=root over29×5
=5root over29
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