যদি (a + 1/a) = 4 হয় তাহলে a2+1/a= কত?

A 9

B 12

C 14

D 18

Solution

Correct Answer: Option C

a2+1/a2= (a + 1/a)2 – 2 a.1/a
            = (4)2  - 2
            = 16 – 2
            = 14

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