a + 1/a = 3 হলে a2 + 1/a2 = কত?

A 11

B 13

C 7

D 9

Solution

Correct Answer: Option C

a + 1/a = 3 হলে,
⇒ (a + 1/a)2 = 3[বর্গ করে]
⇒ a2 + 2 + 1/a2= 9
⇒ a2+ 1/a2= 9 - 2
∴a2+ 1/a2= 7

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