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1. x + y = 8; x - y = 6 হলে x2 + y2 এর মান কত?
- A. 40
- B. 40
- C. 40
- D. 40
Answer: Option C
Explanation:
x^2+y^2
=1/2{(x+y)2+(x−y)2}
=1/2{(8^2+6^2)}
=1/2 ×100
=50
=1/2{(x+y)2+(x−y)2}
=1/2{(8^2+6^2)}
=1/2 ×100
=50
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