1.

Solve : `(|x-1|-3)(|x+2)-5) lt 0`.

Answer» Correct Answer - `x in (-7,-2) uu (3,4)`
We have `(|x-1|-3)(|x+2|-5) lt 0`
Case I : `x ge 1`
`:. (x-4)(x-3) lt 0`
`:.x in (3,4)` .......`(i)`
Case II : `-2 le x lt 1`
`:. (x-3)(x+2) gt 0`
`:.x in (-oo,-2)uu(3,oo)`
`:. Xin phi` (as `-2 le x lt 1`)
Case III : `x lt -2`
`:. (x+2)(x+7) lt 0`
`:.x in (-7,-2)` ..........`(ii)`
From `(i)` and `(ii)`, `x in (-7,-2)uu(3,4)`


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