x + y = 7 এবং xy = 10 হলে, (x-y)2 এর মান কত?
Solution
Correct Answer: Option C
(x-y)2 = (x+y)2 - 4xy
= 72 - 4.10
= 49 - 40
= 9
= 72 - 4.10
= 49 - 40
= 9
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