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1. x+y=4, x-y=2 হলে xy এর মান -
- A. (2,4)
- B. (2,4)
- C. (2,4)
- D. (2,4)
Answer: Option C
Explanation:
আমরা জানি,
4xy=(x+y)2−(x−y)2
⇒4xy=(4)2−(2)2
=16−4
=12
xy =12/4=3
4xy=(x+y)2−(x−y)2
⇒4xy=(4)2−(2)2
=16−4
=12
xy =12/4=3
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