jordanyeargin25
jordanyeargin25 jordanyeargin25
  • 13-06-2018
  • Mathematics
contestada

Which of the following is the solution to | x -12 | < 15


A. X< 27
B. X<27 and x< -3
C. X < 27 or x > -3
D. X<27 and x > -3

Respuesta :

caylus
caylus caylus
  • 13-06-2018
Hello,
Answer D    -3<x<27
Indeed:
1)
if x-12≥0 then x≥12 and
|x-12|=x-12x-12<15 → x<27
so 12≤x<27
2) if x-12<0 then
x<12 and|x-12|=-(x-12)<15
-x+12<15-x<3 → x>-3
So -3<x<12
Thus -3<x<12  U 12≤x<27 ⇔ -3<x<27

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