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