x - y = 4, এবং xy = - 9 হলে (x + y)2 এর মান কত?

A - 20

B 52

C 25

D 32

Solution

Correct Answer: Option A

x – y = 4
এবং xy = -9
.: (x + y)2 = (x + y)2 + 4xy
                = (4)² + 4.(-9)
                = 16-36=-20

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