a²-5a+1= 0 , a²+1/a²=? ,a≠ 0
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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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