3x+4x+1=2 হলে x এর মান কত?
A
2
B
4
C
1
D
3
Correct Answer: 3
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