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 = 7 
xy = 10 

এখন
(x - y)2 = (x + y)2 - 4xy 
            = 72 - 4 × 10
            = 49 - 40 
            = 9

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