x2+12= 5x2 হলে, x -1x এর মান কত?
A
3
B
1
C
22
D
8
Correct Answer: 1
We have ,x2+12=5x2Or , x2+1=5 xOr , x+1x=5x- 1x = x + 1x2 - 4. x.1x = 5-4So , x-1x=1