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1. a+b =17 এবং ab=60 হলে a-b = কত?
- A. 7
- B. 7
- C. 7
- D. 7
Answer: Option A
Explanation:
আমরা জানি,
(a−b)²
= (a + b)² −4ab
= (17)²−4×60
= 289−240
= 49
সুতরাং (a−b)2 = a−b = √49
= 7
(3)2 : (2)2 = 9:4">
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