Question

a²-5a-1=0 .find a²-1/a²​

Answer 1

answer

   a2−5a−1=0

=>a2−1=5a

=>a−a1=5

Squaring both sides, we get

=>a2+a21−2a×a1=25

=>a2+a21=25+2

=>a2+a21=27

Now,

(a+a1)2=a2+a21+2a×a1

                       =a2+a21+2

                       =27+2

                       =29

a+a

Answer 2

Answer:

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