Math, asked by amannishad385, 1 month ago

21. If (2+√5) find the value of

Answers

Answered by arulselvan7273

0

Answer:

If a=2+

5

, then find the value of a−

a

1

Answer

a

1

=

2+

5

1

=

2+

5

1

∗

2−

5

2−

5

=

4−5

2−

5

=

5

−2

Hence, a−

a

1

=2+

5

−

5

+2=4

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