x2 + y2 = 18 এবং xy = 7 হলে (x - y)2 এর মান কত?
Solution
Correct Answer: Option A
(x - y)2 = x2 - 2xy + y2
= (x2 + y2) - 2xy
= 18 - 2 × 7
= 18 - 14
= 4
= (x2 + y2) - 2xy
= 18 - 2 × 7
= 18 - 14
= 4
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