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1. (3/X)+[4/(X+1)]=2 হলে X এর মান কত?
- A. ১
- B. ১
- C. ১
- D. ১
Answer: Option C
Explanation:
3/x + 4/(x + 1) = 2 => {3(x + 1) + 4x }/x(x + 1) = 2 => {3x + 3 + 4x} = 2 (x2 + x) => 7x + 3 = 2x2 + 2x => 2x2 - 5x - 3 = 0 => 2x2 - 6x + x - 3 = 0 => 2x(x - 3) + 1(x - 3) = 0 => (2x + 1) (x - 3) = 0 if, x - 3 = 0 => x = 3
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