a+b=9m এবং ab=18m2 হলে a-b=?
Solution
Correct Answer: Option E
a+b=9m এবং ab=18m2
(a+b)2 = 92
=> (a-b)2 + 4ab = 81
=>(a-b)2 + 4.18 =81
=> (a-b)2 =9
=> a-b =+-3
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