1 . a + b = 9m এবং ab = 18m2 হলে, a - b =কত?
Answer: Option D
Explanation:
ব্যাখাঃ ( a - b)2 = ( a + b) 2 - 4ab
= (9m)2 - 4×18m
= 81m2 - 72m
a - b = + - 3m
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