x – y = 2 এবং xy = 15 হলে (x + y) এর মান কত?

A 4

B 8

C 10

D 12

Solution

Correct Answer: Option B

দেওয়া আছে, x-y = 2
xy=15
(x+y)2 = (x-y)2 + 4xy
           = 22 + 4.15
           = 4+60
⇒(x+y)2 = 64
⇒(x+y)2 = 82
⇒ x+y = 8

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