Question

a^2-5a-1=0;a+1/a

answer it please ​

Answer 1

Answer:

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±

29

Step-by-step explanation:

a

2

−5a−1=0

=>a

2

−1=5a

=>a−

a

1

=5

Squaring both sides, we get

=>a

2

+

a

2

1

−2a×

a

1

=25

=>a

2

+

a

2

1

=25+2

=>a

2

+

a

2

1

=27

Now,

(a+

a

1

)

2

=a

2

+

a

2

1

+2a×

a

1

=a

2

+

a

2

1

+2

=27+2

=29

Thus, a+

a

1

=±

29