Question

[X]=-4, [x+1]=3, [2x+1]=5, [2-2x]=-1, [2x+3]=7
Va rog e urgent!!!! Repede!Dau coroniata.

Answer 1

a) |x|=-4 
|x|= 4 / -4 => x=4
b)|x+1|=3
|x+1|=3 / -3
x+1=3/-1 => x=2
x+1=-3|-1=>x=-4
|x+1|=|2+1|=|-4+1|
c)|2x+1|=5
|2x+1|=5/-5
2x+1=5/-1=>2x=4/2=>x=2
2x+1=-5/-1=>2x=-6/:2=>x=-3
|2x+1|=|4+1|=|-6+1|
d)|2-2x|=-1 
x=multimea vida.Nici un modul nu da ca rezultat un nr negativ.
e)|2x+3|=7
|2x+3|=7/-7
2x+3=7/-3=>2x=4/:2=>x=2
2x+3=-7/-3=>2x=-10/:2=>x=-5
|2x+3|=|4+3|=|-10+3|