Discuss Forum
1. যদি a2 + 1/a2 = 51 হয়, তবে a - 1/a এর মান কত?
- A. ±9
- B. ±9
- C. ±9
- D. ±9
Answer: Option B
Explanation:
এখানে,
a^2+1/a^2=51
⇒(a−1/a)^2+2.a.1/a=51
⇒(a−1/a)^2=51−2
⇒(a−1/a)^2=49
⇒a−1/a=±7
a^2+1/a^2=51
⇒(a−1/a)^2+2.a.1/a=51
⇒(a−1/a)^2=51−2
⇒(a−1/a)^2=49
⇒a−1/a=±7
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