x+y=7 এবং xy=10 হলে,(x-y)2 এর মান কত?

A 3

B 6

C 9

D 12

Solution

Correct Answer: Option C

(x-y)2 = (x+y)2 - 4xy 

= 72 - 4.10

= 49 - 40 = 9 

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