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1. If (x+y)=8 and (x-y)=6, what is the value of xy?
- A. 7
- B. 7
- C. 7
- D. 7
Answer: Option A
Explanation:
দেয়া আছে , x + y = 8 , x - y = 6xy = (x + y2)2 - (x - y2)2 = (82)2 - (62)2 = 644 - 364 = 64 - 364 = 284 = 7
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