x + y = 7 এবং xy = 10 হলে (x − y)2 এর মান কত?

A 6

B 32

C 4

D 9

Solution

Correct Answer: Option D

•  (x − y)2
= (x + y)2 − 4xy
= 72 − 4 * 10
= 49 − 40
= 9

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