যদি a2 + 1/a2 = 51 হয়, তবে (a - 1/a) এর মান কত?
Solution
Correct Answer: Option B
a2+1/a2= 51
⇒ (a - 1/a)2+2.a.1/a = 51
⇒ (a - 1/a)2= 49
∴ a - 1/a = √49 = ±7
⇒ (a - 1/a)2+2.a.1/a = 51
⇒ (a - 1/a)2= 49
∴ a - 1/a = √49 = ±7
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