InterviewSolution
Saved Bookmarks
| 1. |
Solve ` 2 log_(3) x - 4 log_(x) 27 le 5`. |
|
Answer» Let ` log_(3) x = y` ` rArr x = 3^(y)` (i) Therefore, the given inequality becomes ` 2log_(x) x - 12 log_(x) 3 le 5` ` or 2y - 12/y le 5` ` or 2y^(2) - 5y - 12 le 0` ` or (2y+3)(y-4) le 0` ` rArr y in [-3/2 , 4]` ` rArr - 3/2 le log_(3) x le 4` ` rArr 3^(-3//2) le x le 81` |
|