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1. x-y=1, xy=56 হলে x+y= কত?
- A. ১৬
- B. ১৬
- C. ১৬
- D. ১৬
Answer: Option B
Explanation:
X - y = 1 xy = 56 (x - y)^2 = x^2 + y^2 - 2xy 1 = x^2 + y^2 - 112 1 + 112 = x^2 + y^2 x^2 + y^2 = 113 (x + y)^2 = 113 + 112 = 225 x + y = 15
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