a + 1/a = 3 হলে, a2 + 1/a2 = ?

A

2

B

4

C

5

D

7

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প্রশ্ন: a + 1/a = 3 হলে, a2 + 1/a2 = ?

সমাধান:

a2 + 1/a2 = (a + 1/a)2 - 2.a.(1/a)

= (a + 1/a)2 - 2

= 32 - 2

= 9 - 2

= 7

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Updated: 3 days ago

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