a + b = √7, a - b = √3 হলে 5ab এর মান -
Solution
Correct Answer: Option C
আমরা জানি
4ab = (a + b)2 - (a - b)2
⇒ 4ab = (√7)2 - (√3)2
⇒ 4ab = 7 - 3
⇒ 4ab = 4
⇒ ab = 1
⇒ 5ab = 1 × 5
∴ 5ab = 5
4ab = (a + b)2 - (a - b)2
⇒ 4ab = (√7)2 - (√3)2
⇒ 4ab = 7 - 3
⇒ 4ab = 4
⇒ ab = 1
⇒ 5ab = 1 × 5
∴ 5ab = 5
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